17.27 ct Green Tourmaline - Emerald Cut

At 17.27 carats, this tourmaline from Nigeria carries its green color through an emerald cut, measuring 26.2 x 10 x 7.6 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 is entirely untreated; no heat, no enhancement, the color exactly as the earth made it.

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.