尖晶石

例句：

1. 1. The gemstone is a rare and valuable mineral.
   这块宝石是稀有且珍贵的矿物。
2. 2. The diamond was cut into a beautiful shape for the wedding ring.
   钻石被切割成美丽的形状作为婚礼戒指。
3. 3. This piece of jewelry is made from a rare type of sapphire called a spinel.
   这件珠宝是由一种名为尖晶石的罕见蓝宝石制成的。