Tanzanite Pictures. – Mark

 

Swarovski Crystals»

A post by Sheweta

The sparkling beauty of original diamonds in the precision-cut lead crystal glass is introduced to the world by the luxury brand - Swarovski. All the products like decorative pieces and jewelries made from these branded crystal glass is breathtaking. The beauty of all Swarovski jewelry is simply exquisite. Every single piece is designed brilliantly keeping the feminine characteristics in mind therefore when it is worn it surely would make an average looking female changed into an attractive lady instantly. All precision-cut lead crystal glass products are produced only by Swarovski AG of Wattens, Austria. ....

More
 

Diamond clarity refers to the degree of transparency in the gemstone. If the number of flaws is less it indicates higher clarity and vice versa. Gems with more than 80% clarity are very rare in nature. Today, with new modern techniques it is possible to remove or reduce flaws and boost the clarity of natural diamonds. Mechanical treatments are widely used to enhance diamond clarity by removing the unwanted external and internal flaws from the stone. ....

More
 

Modern Crystallography»

A post by Ritika

The origins of crystallography lie in morphology which deals with the study of mineral crystals and also anisotropy which details the physical attributes of mineral crystals. ....

More
 

Recrystallization is the technique of purifying solids based on their different solubility. That is, recrystallization deals with the cleaning method or the transformation of a crystal structure, as a result of the change in external factors, for example temperature and pressure.....

More
 

A consistent repeated pattern of connected atoms or molecules would result in formation of a crystal. There are several techniques used for growing crystals. ....

More
 

Crystallography Topology»

A post by Ritika

Crystallography refers to the analysis of atoms in crystals and topology refers to the study of distortion and invariant connectivity characteristics of mathematical objects. Thus, crystallographic topology deals with association of the two attributes together. The topology of crystallographic groups is approached using orbifolds, and that of simple crystal structures using Morse functions on orbifolds. ....

More
 

Symmetry operations are used to describe the crystal's outward symmetry. Symmetry operations help to define the manner in which a crystal can repeat the facets or faces on their crystal's surface. ....

More
 

Bravais Crystal Lattice»

A post by Ritika

Bravais crystal lattice in crystallography is used to explain the geometrical symmetry of a crystal in details. The other term used to refer to bravais crystal lattice is space lattice. ....

More
 

Attributes of Crystals»

A post by Ritika

The physical attributes of crystals need to be studied in detail for the categorization of crystals. This is a highly specialized field of crystallography. ....

More
 

Quasicrystals»

A post by Ritika

Quasi crystals stand as a special case of in-commensurate crystal phase. Quasi crystals are present in a space group having more than three dimensions. For instance, structures like dihedral and icosahedral structures are categories belonging to this type. Even the two-dimensional Penrose patterns could be matched with symmetry structure of quasi crystals. ....

More
 

The crystal groups are broadly classified into thirty two classes of symmetry. These broad classifications of crystal classes are got based on the exterior form of crystal. These broad classifications of thirty two crystal classes further have 230 sub space groups. These vary among themselves and are classified based on the analysis and observation of x-rays. It is also an interesting fact that even crystals made from the same mineral possess different crystal forms. This is attributed to each mineral's crystal conditions of growth.....

More
 

The six crystal systems could be well understood by getting a fair knowledge about the topic of solid geometry. For this one must have a base knowledge about crystallographic axes. In broad classification, there are six crystal systems in general. The crystallographic axes play a vital role to segregate and place all well known minerals into these six crystal systems.....

More
 

Crystallographic Symmetry»

A post by Ritika

The Crystallographic Symmetry and the applications related to it are vital for people related to various fields namely mathematicians, physicists, and chemists and so on and many researches and investigation related to these have been carried by them. The operations related to crystallographic symmetry could fall in any of the different kinds of available isometries. So first it is essential to have a fair knowledge about isometries and its kinds which will be dealt in the below section. Generally an object is referred as symmetric with respect to a transformation only if the object appears to be in a state that is identical to its initial state after the transformation. In terms of crystallography the types of symmetry is in terms of an apparent movement of the object such as some type of rotation or translation. ....

More
 

Crystal Lattice Structures»

A post by Ritika

The various gemstones take their shape and structure based on their unique crystalline structure that each gemstone possesses. These crystalline structures of each gemstone is based and made from a mixture of different elemental compounds. Thus the atomic structure associated with elemental building blocks contributes towards the shape of a crystal or gemstone. ....

More
 

The physical properties of crystals like hardness, cleavage, optical properties, heat and electrical conductivity differ from crystal to crystal. Crystallographers deem it necessary to learn more about these properties so that they can determine what the crystals can be used for. ....

More
 

What is Crystallography»

A post by Ritika

Crystals are known for their beautiful external appearance. However, it is their internal structure, which is too small to be seen by the naked eye, that makes them interesting to scientists. The study of the growth, shape, and geometric character of these beautiful forms of minerals is called crystallography. ....

More
 

Basic Crystallography»

A post by Ritika

Basic crystallography is about the fundamental principles of geometrical crystallography which are brought in through the medium of symmetry operations, lattices, and the creation of point and space groups. ....

More
 

Fake Gemstone names»

A post by Mark

List of Fake and false gemstone names and its Preferred Gemological Names..

More
 

There are various decisive tests to assess the authenticity of a diamond. The Ceres Diamond probe, Rayner Diamond Tester, Diamond Pen are a few popular instruments. ....

More
 

Diamond Marketing by De Beers»

A post by Erum Qureshi

That ‘a diamond is forever’ is the probably the world’s greatest, most expensive and widely circulated PR scam! The on-going, century-long campaign by diamond giant De Beers owned by the Oppenheimer family began in 1938; De Beers needed a slogan for diamonds that expressed both the theme of romance and everlasting love. ....

More
 

Jewellers Loupe»

A post by Ritika Changrani

A jeweller's loupe is a tool that helps identify the internal flaws, cracks and blemishes on the surface and any other cover ups on the gemstone.....

More
 

Aquamarine Identification»

A post by Erum Qureshi

Aquamarines, belonging to the Beryl family, are relatively easy to identify. Various simple tests can reveal the authenticity of an aquamarine stone. ....

More
 

Spinel Identification»

A post by Erum Qureshi

A gemstone purported to be a spinel undergoes stringent tests in the lab for authenticity and grades (i.e. quality). It has distinctive characteristics and traits that a gemologist can easily identify. ....

More
 

Spectroscope»

A post by Ritika Changrani

A Spectroscope helps to identify cut stones, rough stones, mounted stones and unmounted stones to see whether they are real or fakes. ....

More
 

Refractometer»

A post by Ritika Changrani

A Refractometer is a gemmological tool used to find the ability of gemstone to bend or refract light. This measure is the refractive index of a gemstone. ....

More
 

Polariscope»

A post by Ritika Changrani

Polariscope is an instrument used in gemmology which helps to find if the gemstone is single refractive or double refractive and also allows determining the various crystal axis of the stone. ....

More
 

Dichroscope»

A post by Ritika Changrani

Dichroscope is a tool used to differentiate similar looking gemstones based on the dichroic property of the gemstones. ....

More
 

Chelsea Filter»

A post by Ritika Changrani

Also known as Emerald filter, Chelsea filter is used to identify natural, synthetic and imitated gemstones. Developed by the British Gemmologists Anderson and Payne, this filter was initially developed only for the separation of natural emerald from green beryl. Now it is being used to identify various gemstones. ....

More
 

Lab identification of Sapphire»

A post by Erum Qureshi

Sapphire, derived from the Greek word sapphirus, literally means blue. Many people will find it difficult to believe that ruby, with its intense red color and the royal blue sapphire are the same mineral corundum composed of oxygen and the light metal aluminium. ....

More
 

Ruby Identification»

A post by Erum Qureshi

Step by step laboratory identification procedure for Rubies. "There are numerous tests conducted to identify true rubies. Various characteristics and traits are judged by a gemologist to authenticate and grade a ruby" ....

More
 

Emerald Identification»

A post by Erum Qureshi

Step by step lab procedure to identify the green stone emerald in scientific manner. Learn from an expert, how the Refractive Index, Double Refraction, Absorption Spectra is used to determine the stone type. ....

More
 

Gemstone Hardness Chart»

A post by Mark

Gemstone Hardness Chart in Mohs scale .

More
 

Making Beaded Jewellery - Part IV»

A post by Bina Shaji Kurup

A mind boggling range of cords, threads and wires are to be had for the creative beader – bright colors, braids, thin, thick, natural, synthetic and much more - making a choice is not easy. Some of the popular options in synthetic cords are listed below to make it easier ....

More
 

Making Beaded Jewellery - Part III»

A post by BINA SHAJI KURUP

An important item in every beader's list is the stringing material to be used for putting together the beads. Natural and manmade alternatives are available in every material - silk, cotton or leather. Most of the manmade cords are stronger but lack the flexibility (important if knotting is a part of the design) of the natural product. If is best to first decide on the design and the type of beads and to be utilized while creating the jewellery and select threads based on these factors. ....

More
 

Jewellery Making Tools»

A post by Binasaji

Tweezers:This simple tool is great for picking up and holding small items! Several varieties of tweezers are available for different purposes - Locking tweezers for grasping your jewellery as you work with it; Bent End Tweezers with angled or bent ends for a better grip on small objects; Knotting Tweezers with sharp tips to knot thread to the bead. Beading Awls / Stoppers: Mistakes are a part of learning but undoing knots is an annoying task, even for the most patient beader! The beading awl is ideal to undo irritating knots with great ease. It can also help in knotting and making small loops or winding wires and threads. ....

More
 

Making your own beaded jewellery can be lots of fun and a great way to set your creativity loose. With the help of the internet, you can become a great designer very soon. Plenty of websites list step by step instructions to make beaded jewellery – or you easily give shape to your own dreams and create a unique look- different from the run-of-the-mill ideas! Before embarking on a beaded jewellery making mission, it would help to understand that although the designs shown on the internet sites look easy, making a piece that looks similar to the one on your computer monitor can take several attempts. Patience and lots of practice will help you perfect the art of making professional looking beaded jewellery from home. ....

More
 

Gold Metal Beads»

A post by Binasaji

Glittering bright, gold beads are for those who are enticed by the lure of the yellow metal and can afford it - for gold is the most expensive metal (other than Platinum). Gold beads look great whether they are teamed with precious gems or just by themselves. The history and myths related to gold are myriad and gold beaded jewellery serves dual purposes of ornamentation and as a secure investment for the future.....

More
 

Silver metal beads»

A post by Binasaji

Silver has been used to create jewellery since time immemorial. The Navajos combined silver with turquoise to make gorgeous jewellery pieces like the Squash Blossom necklaces and silver bracelets with inlay work. These are popular even today. Silver is cheaper than gold but is equally attractive; with men and women, both wearing silver jewellery. ....

More
 

Jewellery Manufacturing»

A post by Ms Nandita Ray

Today jewelry is crafted using the traditional method of simple tools and skilled fingers to modern tools and hi tech means. The flow of ideas and the wide range of designs offer this choice. Mass production or made to order is the other factor in choosing a particular method of production. Here is an attempt to bring to the reader a comprehensive idea about jewelry manufacturing. ....

More
 

Crystal Beads»

A post by Bina Shaji Kurup

Crystal is a term with dual meanings – one crystal refers to the naturally occurring colorless quartz (also called a semi-precious stone), which is termed as crystal quartz and the other is man-made crystal which is the subject of this article. ....

More
 

Metal Beads»

A post by Bina Shaji Kurup

Metals beads are extremely popular in creating beaded jewellery. They can be segregated into precious metals – gold, platinum and silver and the cheaper non-precious metals like brass, copper and pewter or cast. Although the beads themselves can be plain, carved, with inlay work and in myriad shapes, the metal beads can be either hollow or solid and plated or non-plated beads. ....

More
 

Glass Beads»

A post by Bina Shaji Kurup

One way to ensure your beads last for a longer while is to confirm that they are Fire-polished. This is a technique whereby beads are first encrusted with the required coating and then they are pulled through high temperatures, melting the surface of the glass bead ensuring the coating bonds with the glass making it permanent. ....

More
 

An array of Beads»

A post by Bina Shaji Kurup

Buying beaded jewellery, like buying any other jewellery is a joy and it can be great fun deciding what beaded jewellery will suit and reflect your personality. The choice available in beaded jewellery is vast, there are glass beads, crystal beads, wooden beads, plastic beads, precious and semi-precious stone beads and much more. ....

More
 

Beaded jewelry»

A post by Bina Saji

Whether your style is hip-hop, casual, trendy or formal. There is myriad scope for beaded jewellery which appeals to people in every age group. Doesn't matter whether you are six years, sixteen, in your thirties or even sixties - beads belong to everyone. Depending on the occasion and your style - beads are suited for everyone. ....

More
 

Jet Jewelry»

A post by Ms Nandita Ray

Jet is compressed driftwood which when saturated with water sinks to the floor of the sea and remains there for ages. These remains of coniferous trees get compressed and hardened and chemically changed due to heat, pressure and the chemicals present in the water. ....

More
 

Ivory Jewelry»

A post by Ms Nandita Ray

Getting hands on real Ivory is like “living in an Ivory Tower’, next to impossible. This is because real Ivory from the now endangered Indian Elephants is banned. ....

More
 

Jewelry made out of organic elements i.e. made out of the remains of living beings and containing carbon is called organic. Apart from Pearls and corals, jewelry made out of Jet, Hair, Shell, Ivory, Bones, and Wood; are all organic in nature. ....

More
 

Organic jewelry is the amazing blend of old and new phase that is instinctive raw material used for crafting stunning jewels using modern techniques and designs. Thus, this article endeavors to provide the related information about the natural material used for making organic ornaments such as necklace, bracelets and earrings. ....

More
 

Organic Jewelry»

A post by Ms Nandita Ray

What is organic? Anything that is derived from living organisms and containing carbon compounds is organic in nature. Jewelry made from organisms that were once living creatures or their product is considered organic jewelry. Amber, bamboo, Bone, Horn, Stone, Hardwood, Pearls, Ivory, Hair and Coral are some of the organic elements used in jewelry. ....

More
 

Gemstone Cutting»

A post by Sheweta Dhanuka

Gem cutting is a long process that takes many months to convert simple rough into fascinating gemstone. It involves many steps. In order to acquaint the reader with the overall process of gem cutting, all the steps are explained one after the other. The steps elucidated are not in any fixed sequence. ....

More
 

Opalescence effects in Opal»

A post by Nasrina Parvin Khan

The milky, turbid aspects of opal described as opalescence. This phenomenon has been seen in common opal or potch opal. These types of opal do not show a play of color. ....

More
 

Gemstone Testing tools»

A post by Ms Nandita Ray

It is tricky to test a gemstone. Some stones are soft, some are mounted while some can be coated, treated or easily scratched. One has to be very careful so as not to damage the stone in any way. With technology advancing rapidly, the tools used for testing are made to suit ones needs and pockets. Aiding the tools is a wide range of database, which lists the particular characteristics of gems. ....

More
 

Color Change phenomenon in Gems»

A post by NASRINA PARVIN KHAN

Gems change their color according to the nature of the light they are seen. Alexandrite appears gr4een in daylight or fluorescent light (blue in rich) and in incandescent light (orange to red rich light) it appears as red. ....

More
 

Labradorescence»

A post by Nasrina Parvin Khan

Labradorescence is an exclusive optical phenomenon that has solely shown by the feldspar gem Labradorite in this earth. ....

More
 

Play of Color»

A post by Nasrina Parvin Khan

A well-known Play-of-color gemstone is opal. Opal is an amorphous from of silica (sio2, nh2o). It is made up of sub microscopic spheres of silica with a little amount of water and air trapped in the spaces between these round spheres. ....

More
 

Asterism in Gems»

A post by Nasrina Parvin Khan

"Asterism" is an exclusive light effect (which we called special optical phenomenon) of some crystal. When light pass through these crystals, its exhibit a star-shaped figure, which called "asterism". ....

More
 

Special Optic Phenomena in Gems»

A post by Nasrina Parvin Khan

Asterism, chatoyancy, play-of-color, opalescence, labradorscene, adularescence and color change are some special optic phenomena which have been seen in gems. ....

More
 

Topaz - How to Identify»

A post by Ardamun

Citrine is mostly, and erroneously, called topaz, though both are two distinct species. Citrine is quartz, and is much lighter than topaz, which is Hydroxyl Fluorosilicate of Aluminum. ....

More
 

A deep look shows signs of slow crystallization in case of natural sapphires. Sometimes some external elements in very small quantities are visible in original sapphire like most other gemstones. ....

More
 

Pleochroism in gemstones»

A post by Yuman Hussain

Scientific explanation of pleochronism which is an ability of the stone to absorb different wavelengths of light displaying brilliant colors when viewed from different directions. ....

More
 

International colored Gemstone Association has its headquarters in Newyork city; U.S.A. It also has additional bureaus in Idar- Oberstein and Israel. It has over 400 members in 41 countries worldwide. ....

More
 

Synthetic emeralds are produced in Germany, France, and United States of America with flux growth and hydrothermal processes in laboratory. These are expensive methods and difficult to yield major results .It is mentioned that the first synthetic emerald appeared in last part of last century. ....

More
 

Metals Used in Jewelry»

A post by Ardamun

The most common types of metals used in jewelry are gold, silver and platinum. Other metals used include titanium, and stainless steel. Gold alloys used in jewelry range from 10K to 21K, whereas platinum alloys are 90% pure to 95% pure. Silver in the form of Sterling Silver is mostly used in jewelry. ....

More
 

How Pearls are graded»

A post by Bina Shaji Kurup

A good pearl has several qualities and based on these qualities pearls are graded. There are two systems of grading pearls, which are accepted worldwide. One system is the “Tahitian” system developed by the Polynesian government. This system is used to grade Black Tahiti pearls and other Saltwater pearls like the South Sea pearls. The other is the “AAA – A” system, which is used to grade cultured Freshwater pearls. ....

More
 

Factors affecting quality of pearls»

A post by Bina shaji kurup

An important factor in deciding the quality of the Pearl is its Luster. A high luster is visible in the reflections on the surface of the pearl – a clearer reflection signifies a better luster and such pearls seem to have a warm glow. The luster of the pearl is dependant on the thickness of the nacre coating on the pearl – it is normally understood that the longer a pearl is left inside the mollusk, the thicker is the nacre layer. ....

More
 

How gemstone hardness measured»

A post by Binashaji

Diamonds measure 10 on the MOHS scale and Aquamarine measures 7 whereas Pearls can measure between 3 and 4 on the MOHS scale. MOHS is a term oft used in Gemstone Jewellery, but what exactly does MOHS mean and signify?....

More
 

Appraising the Value of Gems»

A post by Mathew Abraham

Gems are appraised mainly to determine their fair market value (FMV) or for insurance purposes. Qualified gemologists undergo specialized training to be certified as accredited appraisers of gems. If a gem has been certified by a Master Gemologist Appraiser, his/her valuation is accepted as final. ....

More
 
home»