Shining light on “480 nm band” diamonds: Gemmological characteristics of an unusual group of diamonds with yellow and red luminescence

Amber was recently discovered by local coal miners at the Thanbaya Gaing Coal mine located 6.5 km no

Emerald is the green variety of beryl, with its distinctive color resulting from trace amounts of ch

A newly observed variety of faceted transparent brown sapphire has recently entered the gem market,