spinel ruby

1. The boom has also boosted semi-precious stones, such as rubellite and red spinel, worn by those who can't quite stretch to a ruby.
   宝石业的兴隆也促进了半宝石业的发展，像红电气石、红尖晶石，有些人买不起一颗真正的红宝石，也会佩戴这些半宝石。

noun

1. a spinel used as a gemstone (usually dark red)

   Synonym:    ruby spinel