There are several factors typically used to grade the stone, with color and patterning being the primary ones: Color – the deeper, "volcanic" blues are considered to be "best". Patterning – the richer,...
JewelsRoughGems, Our Tips for Buying GEM Faceting ROUGH Stones, Tourmaline, Emeralds, Cab Rough, Sugilite, Cabochons, Minerals, Specimens From The Tucson Gem Jewellery Shows, The Massive shows are all over...
A Rare and Spectacular Mineral Jewel Geological History It is among the newest gemstones to have been discovered and catalogued in geological literature. Norman Rilling, a US member of the Peace Corps, and...