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Can Anyone identify this unusual black gemstone

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Can Anyone identify this unusual black gemstone? It is set in a large 9ct gold ring setting

Could it be a raw black diamond or Tourmaline?



asked Dec 6, 2017 by GoldRocks (120 points)

2 Answers

0 votes
Most likely onyx.
answered Dec 8, 2017 by Weasel (58,940 points)
0 votes
Could also be bladed hematite or Goethite
answered Dec 26, 2017 by Sperling (250 points)

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