Appraising the Value of Gems
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 …
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How gemstone hardness measured
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. …
Factors affecting quality of pearls
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 …
How Pearls are graded
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, …
International Colored Gemstone Association – ICA
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 …
Pleochroism in gemstones
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 …
Special Optic Phenomena in Gems
Special Optic Phenomena in Gems
Asterism in Gems
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 …
Labradorescence
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 …
Color Change phenomenon in Gems
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 …