If You Need Information On Boulder Opal Rough Then This is The Best Untapped Resource On The Web
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 264CT 100 Natural Australian Black Boulder Opal SBO321  US $1.25
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 LIVELY GEM COLORSHOW SOLID BLACK MATRIX BOULDER OPAL US $375.00
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 AUSTRALIAN BOULDER OPAL ROUGH RUBS US $17.82
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 AUSTRALIAN BLACK OPAL DOUBLET BRILLIANT COLOR DISPLAY US $69.95
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 100 NATURAL YOWAH FIRE OPAL COLOR PLAY RARE GEM STONES US $12.49
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 NATURAL YOWAH FIRE OPAL GREEN COLOR PLAY RARE GEMSTONE US $37.49
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 NATURAL YOWAH FIRE OPAL COLOR PLAY GREEN RARE GEMSTONE US $22.49
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 NATURAL YOWAH FIRE OPAL BLUE COLOR PLAY RARE GEM STONES US $27.49
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 NATURAL YOWAH FIRE OPAL BLUE COLOR PLAY RARE GEMSTONE US $22.49
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 ABSOLUTE RAZZLE DAZZLE SOLID BLACK MATRIX BOULDER OPAL US $885.00
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 Australian Opals Rough Solid Boulder Opal lapidary 2819 US $43.23
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 DYNAMIC COLORSHOW 4ct SOLID BLACK MATRIX BOULDER OPAL US $340.00
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 353CT 100 Natural Australian Black Boulder Opal SBO650 US $1.35
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 ELECTRIC GEM COLORS 6ct SOLID BLACK MATRIX BOULDER OPAL US $480.00
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 Yowah Opal Cabochon Gemstone Australia US $85.00
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 250 GRAMS MEXICAN NATURAL MATRIX BOULDER OPAL ROUGH PARCEL GEMSTONE 84 PCS US $24.99
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 N98 Slab Of Queensland Rough Boulder Opal US $8.00
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 105CT 100 Natural Australian Black Boulder Opal SBO627 US $3.65
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 Australian Opals Rough Solid Boulder Opal lapidary 2832 US $16.21
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 Australian Opals Rough Solid Boulder Opal lapidary 2837 US $16.21
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 Australian Opals Rough Solid Boulder Opal lapidary 2838 US $16.21
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 Great Yowah Boulder Opal Freeform Cabochon 2630 Carats US $19.99
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 KOROIT PICTURE PATTERN STONE SOLID Boulder Opal Pendant US $21.20
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 Nice Koroit Boulder Opal Freeform Cabochon 1915 Carats US $19.99
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 Awesome Koroit Boulder Opal Freeform Cabochon 3365 Carats US $29.99
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 219CT 100 Natural Australian Black Boulder Opal SBO593 US $.99
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 KH Boulder Opal Rough Queensland 250g 1250 carat lot US $15.86
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Stones that can be used in a rock tumbler?
Hi, I'm wondering if there is are specific stones that CAN'T (or shouldn't) be tumbled in a rock tumbler? For example, I have some pieces of rough boulder opal (veins of opal in ironstone) that I would like to tumble, but am worried that the abrasives used in the rock tumbler would harm the patches of opal. Does anyone have any experience with this, or can anyone offer advice? Thanks!
Don't tumble your boulder opal.... you'll end up with nothing.... opal is soft.
Agates, jaspers, glass, Quartz do very well in tumblers, as does Turquoise... just remember not to put rocks of different hardnesses together.... in other words, put only turquoise with turquoise, jaspers, with other jaspers, etc. If you don't, the softer stuff will disintegrate.
polish your boulder opal separately, and be carefullll You could polish away the very opal you are trying to expose.
