By: Jeffrey M. Bertman Graduate Gemologist Call it the “William and Kate effect” if you like, but there is no denying the influence that the

By: Jeffrey M. Bertman Graduate Gemologist In fashion, black never goes out of style. The lustrous, opaque black material known as “jet” has been popular

By: Jeffrey M. Bertman Graduate Gemologist Tanzanite, December’s birthstone, is notable for a number of reasons. To begin with, this beautiful gemstone exhibits a rich

By: Jeffrey M. Bertman Graduate Gemologist Without question, ruby is one of the rarest, most valuable, and highly desirable of gemstones. Finer pure-red rubies in

By: Jeffrey M. Bertman Graduate Gemologist If you think that royalty only wear diamonds, rubies, emeralds, and sapphires, you should know that one of Duchess

By: Jeffrey M. Bertman Graduate Gemologist The color that a gemstone displays is largely determined by the unique way that its individual crystalline structure interacts

By: Jeffrey M. Bertman Graduate Gemologist Opal, the birthstone for October, is an unusual mix of “fire and water” in that the gemstone is composed

By: Jeffrey M. Bertman Graduate Gemologist One trend surging in popularity is the widespread use of pavé-set diamonds in diamond engagement rings. As the name

By: Jeffrey M. Bertman Graduate Gemologist Minnesota Vikings fans are bound to love “ametrine,” along with anyone who appreciates a gemstone that combines the purple