Commercial quantities of gem-quality chrysoprase and green prase opal (nickel-bearing chalcedony and common opal, respectively) have been recovered from altered serpentinite deposits near Haneti, Tanzania.

Play-of-color patches in black opal display interesting written character patterns.

A look at JTV’s history, current activities, and impact on the industry.

Renowned designer Paula Crevoshay discusses artistic influences and her latest creations.