1. 宝石：precious stone necklace 宝石项链 | precious stone 宝石 | precipitant 沉淀剂

2. 钻石：write a scene 写一个场景 | precious stone 钻石 | take up several jobs 找几份工作

3. 珍贵的石头：life guard 救生员 | precious stone 珍贵的石头 | a cold welcome 冷遇

noun

1. a precious or semiprecious stone incorporated into a piece of jewelry

    Synonym: jewelgem