| Such a structure reflects light in unusual ways similar to mother-of-pearl or the gemstone opal. |
| Gem candescence is an optical quality that makes a gemstone look like a brilliant drop of liquid color. |
| Any fluorescence under ultraviolet light may also provide clues to the identity and status of a gemstone. |
| Jacinth is a crystal, bright, purple gemstone. It is called Gomed in Urdu. Pure jacinth contains a very uncommon, precious metal named Zirconium. |
| He said there should be a deliberate policy to compel gemstone companies to sell part of their produce to local jewellers. |
| Morgan finally dug up a gemstone, picked it up and handed it to Evelyn, who put it in a bag. |
