Zoisite and its many color
Bertrandite in Emeralds
Over the past few years we have been seeing more and more lower quality stones in the lab. The reaso
Novel cultured pearls with ceramic nucleus and possible cause of their strong luster
Cultured pearls with a ceramic nucleus (bead) represent a new type of saltwater cultured pearls that
Padparadscha Sapphire & heat treatment
In 2018 the Padparadscha engagement ring of Princess Eugenie (Figure 1), the niece of the king, gave