1. (noun) a gemstone having the property of transmitting light without serious diffusion

• adamant
• diamond
• amethyst
• aquamarine
• aventurine
• sunstone
• calcedony
• chalcedony
• chrysolite
• chrysoprase
• citrine
• emerald
• garnet
• hiddenite
• kunzite
• moonstone
• morganite
• peridot
• ruby
• sapphire
• topaz
• tourmaline
• water sapphire

1. (noun) a gemstone having the property of transmitting light without serious diffusion

• gem
• gemstone
• stone