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92 ct back opal 8x5x3mm
The body tone(N) values have been measured by Anthony Smallwood – the author of the official grading system used worldwide
Nice high domed green stone
The brightness is simplified into 5 levels to support the measure of an opals brightness(B)
29 ct semi black opal 10x7x2
1.36 ct semi black opal 8x7x4mm advice-tools-merch 92 ct back opal 8x5x3mm
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