Opal bodytone scale and instructions

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Opal Bodytone explained for the grading of opal by blackopaldirect.com

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Opal Bodytone and Opal brightness scale explained

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Opal Bodytone \u0026 Brightness Scale Explained

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Opal Body Tone \u0026 Brightness Scale Guide

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What is black opal worth? The body tone myth exposed

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Opal Body Tone Guide

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October’s Birthstone: Opal | Which opal type is your favorite?

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Grading Opals - Body Tone and Brightness

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4 ct N1 body tone solid natural black opal gem by biro opal Australia

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Opal cutting: a quick cut: why body tone matters, how I grade my opal.

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The Base Body Tone Chart For Black Opals

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educational video of the opal body tone chart. please scribe and share with your friends

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Opal N1- N2 bodytone, Australian Black opal, Opal jewelry

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Amazing 2.2 ct N1 bodytone black opal gem by biroopal.com - Australia

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Cutting An Opal With A Heavily Chipped Face. Dark Body Tone Coober Pedy Blue/Green Australian Opal.

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1.55cts lightning ridge gem black opal, N1 Body tone

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Rare! Fantastische LIGHTNING RIDGE SOLID Opal Gem 1.3CT mit Bodytone N1

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NI Body tone Lightning Ridge gem black opal

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