| Cavansite(noun, name, stone, jewel) |
| Centenary Diamond(expression, name, extraordinary, diamond) |
| Chalcedony(noun, name, stone, jewel) |
| Charoite(noun, name, stone, jewel) |
| Chloe Diamond(expression, name, extraordinary, diamond) |
| Chrome Diopside(expression, name, stone, jewel) |
| Chrysanthemum Flower Stone(expression, name, stone, jewel) |
| Chrysoberyl(noun, name, stone, jewel) |
| Chrysocolla(noun, name, stone, jewel) |
| Chrysoprase(noun, name, stone, jewel) |
| Citrine(noun, name, stone, jewel) |
| Cora Sun-Drop Diamond(expression, name, extraordinary, diamond) |
| Coral(noun, name, stone, jewel) |
| Creator(noun, name, extraordinary, diamond) |
| Crinoid(noun, name, stone, jewel) |
| Cross of Asia(expression, name, extraordinary, diamond) |
| Cullinan Diamond(expression, name, extraordinary, diamond) |
| Cullinan I(expression, name, extraordinary, diamond) |
| Cullinan II(expression, name, extraordinary, diamond) |
| Danburite(noun, name, stone, jewel) |