A large number of gems are from silicate minerals in which beryl, topaz, turmaline, garnet, zircon peridote and feldspar are all important gems. 在各类矿物中，硅酸盐矿物宝石种类和数量最多，其中绿柱石、黄玉、碧玺、石榴石、锆石、橄榄石和长石均为重要的宝石。
The results show that specimens containing ferro chromic oxide are with higher susceptibility,while turmaline,agate,synthetic corundum and moonstone are negative in susceptibility and present antimagnetism. 样品中含铁、铬氧化物者磁化率偏大，碧玺、玛瑙、合成刚玉及月光石的磁化率为负，表现出抗磁性
