For Gemologists Archive
For Gemologists Appraising the Value of Gems by Mathew Abraham Gems are appraised mainly to determine their fair market value (FMV) or for insurance purposes. Qualified gemologists undergo specialized training to …
For Gemologists How gemstone hardness measured 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. …
For Gemologists Factors affecting quality of pearls by Bina shaji kurup An important factor in deciding the quality of the Pearl is its Luster. A high luster is visible in the …
For Gemologists How Pearls are graded 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, …
For Gemologists International Colored Gemstone Association – ICA by Ashish Dimri International colored Gemstone Association has its headquarters in Newyork city; U.S.A. It also has additional bureaus in Idar- Oberstein and …
For Gemologists Pleochroism in gemstones 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 …
For Gemologists Special Optic Phenomena in Gems
For Gemologists Asterism in Gems 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 …
For Gemologists Labradorescence by Nasrina Parvin Khan Labradorescence is an exclusive optical phenomenon that has solely shown by the feldspar gem Labradorite in this earth. Iridescence flashes of colors, which appear …
For Gemologists Color Change phenomenon in Gems by NASRINA PARVIN KHAN Gems change their color according to the nature of the light they are seen. Alexandrite appears gr4een in daylight or …