During the past 25 years, the corundum market has been transformed from one of medium to high-priced gems to one that encompasses nearly all price ranges. This transformation was caused by the ...
Those born in January are lucky to have the beautiful and diverse garnet as their birthstone. Garnets are commonly red but also come in an extraordinary range of beautiful colors, including orange, ...
The best ametrines show distinct areas of orangy yellow and purple. These colors are featured in this graceful cut design. Photo by Lydia Dyer, © John Dyer & Co ...
India International Jewellery Show (IIJS Signature) is India's top-of-the-line jewellery show by the GJEPC. The event showcases the best jewellery collections by the country's leading manufacturers.
Through extensive hands-on practice using gemstones, you will explore grading the color, clarity and cut quality of a wide range of colored stones. Coursework includes the study of the GIA Colored ...
莫氏硬度用以衡量宝石和矿物的硬度。 这些数值基于一种矿物可被其他物品划伤的相对难易程度得出。 但莫氏硬度会引起误导。 不同矿物的硬度等级之间的差距并不均匀。 举例来说,钻石的莫 ...
Discover how the world’s foremost experts determine the quality of akoya, freshwater, South Sea, and Tahitian pearls. Explore GIA’s 7 Pearl Value Factors ™. Key topics include how to evaluate cultured ...
Cultured pearls come in different sizes, shapes, and colors. Perhaps the best-loved gems of all time, pearls—both natural and modern cultured pearls—occur in a wide variety of colors. The most ...
Jadeite comes in a wide range of colors. The most valuable is an intense green called Imperial. - Courtesy Mason-Kay Fine Jade Jewelry To understand the value of jade, you have to look beyond its ...
Lower-quality turquoise is softer and more porous and is often treated to make it durable enough to wear. Fine turquoise is naturally beautiful – because it is rare and in demand, it is more valuable.
Fine-color, large, and eye-clean (lacking visible inclusions) rubies like this 11.01carat (ct) stone from Myanmar (formerly known as Burma) are extremely rare and valuable. – Photo: Robert Weldon/GIA.
In 2002, a coalition of governments, non-governmental organizations and the diamond industry established the Kimberley Process to control the export and import of rough diamonds to eliminate the trade ...