Australian Semi Black Opal Gemstone 2.48cts N5 Body Tone B3 Brightness – Opal Fever Mate
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1.30 CT LIGHTNING RIDGE MILKY OPAL BODY TONE N6 JJ178
Semi Black Opal Gemstone 0.99cts N5 Body Tone B2 Brightness Amazing Ne – Opal Fever Mate
Australian Semi Black Opal Gemstone 2.2cts Coocoran Field N5 Body Tone – Opal Fever Mate
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Black Opal Brightness and Body Tone Guide | Blue opal jewelry, Opal, Unique opal
Australian Semi Black Opal Gemstone 1.9cts Gem Grade N5 Body Tone B2 B – Opal Fever Mate
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About Opal– Global Opals
THIRTY BODY TONE CHARTS-FROM OPAL ASSOCIATION
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Australian Black Opal Gemstone 7cts Mulga™ Field N2 Body Tone B2 Brigh – Opal Fever Mate
Opal Bodytone and Opal brightness scale explained - YouTube
Opal bodytone and brightness scale - Black Opal Direct
Australian Semi Black Opal Gemstone 1.2cts N6 Body Tone B1 Brightness – Opal Fever Mate
Opal Bodytone explained for the grading of opal by blackopaldirect.com - YouTube
N1 BODY TONE MULTI FIRE BLACK OPAL .55CTS JO 1328
Australian Black Opal Gemstone 7cts Mulga™ Field N2 Body Tone B2 Brigh – Opal Fever Mate
Opals classification and value
