Stones/Gems with C

  • A real mineral; often means rock crystal (quartz)

  • A real rock; counts as a stone, though not a gem

  • A quartz variety used as a gemstone

  • Real mineral/stone; widely known and natural

  • Organic gem material; widely used in jewelry

  • A real gemstone, a type of chalcedony

  • Man‑made diamond simulant, common gem substitute

  • Real mineral (celestite); sometimes gemmy

  • Variety of quartz, clear and colorless. Common crystal.

  • Diamond gemstone described by its cut, valid gem term

  • Hard mineral family incl. ruby & sapphire, key gemstone

  • Mineral strontium sulfate, pale blue gem and collector stone.

  • Trade name for stones showing chatoyancy eye effect.

  • Diamonds are gemstones; “cut” is the faceting style.

  • Soft white rock (limestone type), used as chalk sticks.

  • carbuncle

  • Ancient turquoise‑like gem, prized by Greeks and Romans.

  • Mineral iolite; blue‑violet gem variety of cordierite.

  • Cryptocrystalline quartz family, many colored gem types.

  • Bright yellow diamond trade name, used in jewelry.

  • Lead carbonate mineral, sometimes cut as a soft gem.

  • Old name for kyanite, blue aluminosilicate gem

  • Trade name for clear quartz used as a gem

  • Mercury sulfide mineral, bright red pigment stone

  • Cat’s eye is a chatoyant gemstone variety

  • Cat eye/“cat’s eye” used for chatoyant gems

  • Diamond variety; “clear” is a common trade description 💎

  • Clay is fine-grained sedimentary rock, used in ceramics

The words in the list Stones/Gems with C come from players of the word game City, Country, River.