Purplish Pink Spinel from Tajikistan: Before and After Cutting
Read MoreReviews diamond discoveries at the Lomonosov deposit, as well as the geology of the Arkhangelsk kimberlite province.
Read MoreOpals with an unusual purple bodycolour and strong play-of-colour have recently appeared in the market.
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A new opal deposit was discovered in 2008 near the village of Wegel Tena, in the volcanic rocks of Ethiopia’s Wollo Province.
Read MoreThe heat treatment of corundum involving lattice diffusion of beryllium (Be) at temperatures over 1800°C has become a major issue in the gem trade.
Read MoreAn important deposit of andradite, containing demantoid and topazolite varieties, has been mined near the village of Antetezambato in northern Madagascar since early 2009.
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Gem-quality peridot is occasionally found as mantle xenoliths within basalts near Pozzomaggiore.
Read MoreG. Robert (Bob) Crowningshield has made many significant contributions to the study of gems and the science of gemmology.
Read MoreThe most important source of yellow gem elbaite is the Canary mining area in the Lundazi District of eastern Zambia.
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A new microlithography process developed to create high-resolution diffraction grating patterns on portions of certain facets can improve the dispersion of light and thus the amount of “fire” in a diamond.
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