transparent gem

Từ điển Oxford Learners Wordfinder Dictionary

noun

a gemstone having the property of transmitting light without serious diffusion
• Hypernyms:
gem, gemstone, stone
• Hyponyms:
garnet, amethyst, aquamarine, chalcedony, calcedony,
chrysolite, chrysoprase, citrine, diamond, adamant, emerald,
kunzite, moonstone, morganite, peridot, ruby, water sapphire,
sapphire, hiddenite, sunstone, aventurine, topaz, tourmaline