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- Gemstone (7411 bytes)
3: ...ht|thumb|250px|A selection of gemstone pebbles: made by tumbling rough rock with abrasive grit, in a r...
5: ...ade of [[carbon]] (C), rubies of [[aluminium]] oxide (Al<sub>2</sub>O<sub>3</sub>). Next, many gems ar...
9: ...hroism]] of a sort, or [[double refraction]] to a degree and have an [[optic sign]]. They may have a c...
11: ...splay different characteristics which may aid in identification.
14: ...rkle when faceted. However, it is important to understand that diamonds are far from rare with millio...
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