美石

měishí
  1. precious stone
  2. jewel

CEDICT

Entry Composition

1 美 měi
  1. beautiful
  2. very satisfactory; good
  3. to beautify
  4. to be pleased with oneself
2 石 shí
  1. rock
  2. stone
  3. stone inscription
  4. one of the eight categories of ancient musical instruments 八音 bāyīn

Related entries

琉 liú precious stone
琛 chēn
  1. precious stone
  2. gem
礐 hú (arch.) precious stone
瑤 yáo
  1. jade
  2. precious stone
  3. mother-of-pearl
  4. nacre
  5. precious
  6. used a complementary honorific
寶 bǎo
  1. jewel
  2. gem
  3. treasure
  4. precious
孩子是宝中之宝。

There is no treasure more precious than a child.

Source: Tatoeba

明珠 míngzhū
  1. pearl
  2. jewel (of great value)