15.39 ct Green Tourmaline - Cushion

At 15.39 carats, this tourmaline from Nigeria carries its green color through a cushion cut, measuring 20.03 x 11 x 8.7 mm.

Tourmaline takes a wider range of color than almost any other gem species, because its crystal will accept so many different coloring elements. Nigeria's gem fields rose to prominence in the 1990s and remain a significant modern source. It carries no treatment of any kind, so the color you see is the color that came out of the ground.

Few stones reach this combination of size and quality, and fewer still come to market. We will tell you everything we know about it before you decide.