Most bi colored Tourmalines are cut as octagons, but in this case and probably unknowingly, the cutter chose to cut a traditional step cut pear and the result was this lively stone which retained a striking display of the pleochroic colors.
RARE GEMSTONE: CASSITERITE - 20.77 CT. Ximen, Yunnan Prov., China Although Cassiterite has a number of properties that would make it an exceptional gemstone, its penchant for incorporating Iron into its structure almost always results in material too dark to facet. This oval cushion style stone shows wonderful flashes of rainbow "fire" due a Refractive Index (1.990 - 2.105) and dispersion (0.071) that are very close to Diamond.
One of the rarer varieties within the garnet group, Mali Garnet typically yellowish green, brownish green, brown, or minty green. Mali name is based on the country where the stones are mined in West Africa. It was discovered in 1994 and Mali is still the
Fantastic and Big Golden Yellow Citrine. Oval Cut. 17.43 ct