NATURAL SILLIMANITE (2.22CT) 9X7MM EXCELLENT CUT!! TOP QUALITY (WAV15)

“Sillimanite is an extremely rare and lesser-known collector's gem." ... "Owing to its remarkable resiliency and resistance to high heat and chemical corrosion, sillimanite is an ideal material for both the gem and jewelry trade, as well as various industrial uses." ... "However, with the combined gemological properties of hardness, fracture, tenacity, density and refractive index, sillimanite can be easily identified using basic laboratory equipment." ... "For many years, sillimanite was considered rare and was found in only a few regions of the world." ... "Transparent sillimanite materials are normally yellow to green-yellow and are almost always faceted since the material is highly desired by collectors." ... "Ovals are most common as they tend to preserve the most carat weight and with rare gemstone materials, it is an important aspect to consider before cutting." ... "Sillimanite is not known to be treated or enhanced in any way.”