1. 宝石的：coin silver 800或900银的 | gemstone 宝石的 | gold plated 镀金的的

2. 经雕琢的宝石：gem 宝石 | gemstone 经雕琢的宝石 | gender 性别

3. 宝石类：人造首饰 Synthetic Jewellery | 宝石类Gemstone : | 钻石Diamond

noun

1. a crystalline rock that can be cut and polished for jewelry

e.g. he had the gem set in a ring for his wife
she had jewels made of all the rarest stones

Synonym: gemstone