| NOUN | substance | opaque gem | a gemstone that is opaque |
|---|
| Meaning | A gemstone that is opaque. | |
|---|---|---|
| Narrower | cat's eye | Any of various gems (as chrysoberyl or chalcedony) that reflect light when cut in a rounded shape |
| chrysoberyl | A rare hard yellow green mineral consisting of beryllium aluminate in crystal form | |
| coral, red coral, precious coral | The hard stony skeleton of a Mediterranean coral that has a delicate red or pink color and is used for jewelry | |
| jade, jadestone | A semiprecious gemstone that takes a high polish | |
| jasper | An opaque form of quartz | |
| lapis lazuli, lazuli | An azure blue semiprecious stone | |
| opal | A translucent mineral consisting of hydrated silica of variable color | |
| turquoise | A blue to grey green mineral consisting of copper aluminum phosphate | |
| Broader | gem, gemstone, stone | A crystalline rock that can be cut and polished for jewelry |
| Spanish | gema opaca | |
| Catalan | gemma opaca | |
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