25 ct black opal. Drastic body tone changes. Is this Broad Flash? : r/Opals
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Opal bodytone and brightness scale - Black Opal Direct
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Australian Black Opal Gemstone 7cts Mulga™ Field N2 Body Tone B2 Brigh – Opal Fever Mate
Opal bodytone and brightness scale - Black Opal Direct
Australian Semi Black Opal Gemstone 2.6cts N7 Body Tone B1 Gem Grade B – Opal Fever Mate
Opal Body Tone
Black Opals | Lightning Ridge | Description & Info | Australia
Opal Bodytone explained for the grading of opal by blackopaldirect.com - YouTube
Australian Semi Black Opal Gemstone 3.4cts N7 Body Tone B3 Brightness – Opal Fever Mate
Australian Semi Black Opal Gemstone 2.2cts Coocoran Field N5 Body Tone – Opal Fever Mate
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Australian Semi Black Opal Gemstone 1.9cts Gem Grade N5 Body Tone B2 B – Opal Fever Mate
Opal Bodytone and Opal brightness scale explained - YouTube
Rios-Opale - Lightning-Ridge-Black Opal
