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Types of Opal
> Black Opal
> Boulder Opal
> Crystal Opal
> Fire Opal
> Matrix Opal
> White Opal
> Yowah Nuts
> Opal Doublets
> Opal Triplets
> Opal Jewelry
Buying Guide for Opals
> Opal Store USA
> Birthstone for October (modern); alternate for June
> Care for Opals
> Cutting Opals
> Opal Store Amazon USA
> Opal shop Australia
> Glossary of Terms
> Investing in Opals - The Value of Opals as an Investment
> Lapidary Information
> Buy Opals Australia
Famous Opals
> The Andamooka Opal (The Queen's Opal)
> Aurora Australis
> The Black Prince
> The Butterfly Stone
> The Flame Queen
> Halley's Comet
> Jupiter Five
> Olympic Australis
> Pride of Australia
> The Virgin Rainbow
History of Opals and Opal Mining
> Australian Museum National Opal Collection
> Australian Museum researches opalised fossil
> Fossicking in NSW
> Fossils, opalised fossils, sea snails and shells
> Legendary Opal Miners
> Opal Legends
> Opal Mines
> Mining Opals in Wyoming USA
> Opal Links
Australian Opal Mines
> Andamooka Mines, SA
> Coober Pedy, SA
> Lightning Ridge, NSW
> Mintabie or Mintabee, SA
> Opalton, Qld
> Quilpie, Qld
> White Cliffs, NSW
> Winton, Qld
> Yowah, Qld
Gem & Jewelry Pocket Guide:
A Traveler's Guide to Buying Diamonds, Colored Gems, Pearls, Gold and Platinum Jewelry
by Renee Newman
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Boulder Opals
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The famous Virgin Rainbow Black Opal is for sale here!
Boulder Opal
Boulder opal is a naturally formed solid opal which consists of a fine layer of opal that has been deposited by nature on and in the fissures of ironstone base rock. Because it geneally has a black or very dark background colour it has the appearance of black opal.
There are often inclusions in the opal layer and because the layer follows the contours of natural ironstone the shape is often very undulated. Depending on how the stone is polished it can either be very smooth or be "pockmarked" where ironstone protrudes to the surface. The irregular shape of boulder opal makes it a designers delight and most pieces of jewelry using boulder opal are very unusual.
Boulder opal is found at a number of locations in NSW with some small quantities coming from Andamooka in South Australia.
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Gillett's Jewellers for Australian Opals
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