$12.00 USD

10.81ct Australian Boulder Opal Stone

Dimensions (mm)
23.000 x 16.000 x 4.000mm
Weight (cts)
Carved, Polished

                      Constable & Co

                       Australian Opal

Opal Type: Australian Boulder Opal 

 Origin: Winton Region




 Multi - Colour


 Mixed Flashes

Accuracy of picture:


Base of opal:

Solid Native Ironstone 



Comments:   A free form shape Queensland Boulder Opal with mixed flashes of multi colour with ironstone in the carved face on a solid ironstone base

Please make payment within 48 hours or contact us and make alternative arrangements 

Opal valuation: Our Opal Valuations are a combination of experience gathered over 35+ years in all levels and operations within the opal industry and the internationally recognized Opal Nomenclature and Classification 

Photographing opals: We endeavour at all times to take the most true to life pictures possible. However, cameras often pick up colours and light differently and variations may occur. Because every opal photographs differently, I also include in the description additional comments about the accuracy of the photos. 

Our Guarantee:  We sell quality opal and customer satisfaction is important to us so for any reason you are not completely happy with your purchase please advise us within 7 days of you receiving it. Return the items 100% complete with all packaging and any extras. Refund will be given as soon as the items are confirmed in original condition. We strongly recommend that you fully insure the return shipment in case of loss or damage and use a carrier that can provide proof of delivery.  

 About Constable & Co Australian Opal & Pearl Specialists  The company origins as Colonial Opal and Colonial South Sea Pearl trading in Opal, Pearl and Precious Gems date from the early 1980s experience gathered in all levels and operations within the Opal Industry starting in the Wholesale and Export Gemstone and Jewellery trade within Australia and Internationally then Owning and Operating Opal Specialist Stores in Australia and New Zealand all the while being involved in the Mining, Cutting and Valuing all varieties of Australian Opal and recently with Sons and Daughter joining the company ensuring a continued expertise in the industry.  

Lightning Ridge Opal: Mined in the Outback of New South Wales Australia Black Opal comes from and variety of mining areas around Lightning Ridge  

Black Opal refers to the underlying colour – the colour of the opal when you turn it over. The darker the body the more valuable to stone may be. It is this darkness that lends brightness to the other colours displayed with in the stone. Black and dark opal is the scarcest of all opal and comes from the mines of Lightning Ridge.

Australian Boulder Opal: Mined in the Outback of Queensland Australia our Opal comes from and variety of mining districts including - Winton, Koroit, Yowah, Eromanga, Jundah and Quilpie

Boulder opal is a type of opal that forms within the cavities of ironstone boulders dating from the time when central Queensland was cover by an inland sea The Opal is found in both vertical and horizontal cracks or seams. It is cut with the ironstone remaining on the back and is classified as solid opal.

Boulder Opal occurs over a Vast area of Western Queensland from North of Winton to south of Quilpie. Boulder Opal is considered to be one of the most versatile opals because it has all of the colour and patterns of expensive black or crystals opals but it is contained within the iron stone which makes it extremely durable.

When looked at from the side you can always tell a genuine solid boulder opal by the natural uneven line where the opal filled the void in the boulder.


White Opal: is also known as milky Opal and it has a pale white appearance with bright flashes of Opal colour. On the body tone and brightness chart the body colour of white Opal is N8 or N9. White Opal is capable of displaying any combination of spectral colours such as red, blue, purple and greens. 

The major difference between this type of Opal and the Black Opal is that white Opal tends to have a subdued play of colour since the body colour of the stone is light. In black Opal because the body is very dark the play of colour is much brighter. 

In terms of production the white Opal is by far the most plentiful. In Australia the majority of the opal produced comes from South Australia. There are three main South Australian opal mining fields these are Coober Pedy, Andamooka and Mintabie

Shipping provider Shipping to Australia Shipping to rest of world
Standard Shipping - Tracked $7.00 / 7 days $16.00 / 24 days
Standard Shipping - Tracked is discounted to $7.00 on orders with 2 or more items
Rest of the world
Standard Shipping - Tracked is discounted to $20.00 on orders with 2 or more items
DHL $25.00 / 4 days $55.00 / 10 days
DHL is discounted to $25.00 on orders with 2 or more items
Rest of the world
DHL is discounted to $55.00 on orders with 2 or more items
Express Shipping $12.00 / 4 days $30.00 / 16 days
Express Shipping is discounted to $12.00 on orders with 2 or more items
Rest of the world
Express Shipping is discounted to $30.00 on orders with 2 or more items
Registered Shipping $7.00 / 7 days $14.00 / 28 days
Registered Shipping is discounted to $7.00 on orders with 2 or more items
Rest of the world
Registered Shipping is discounted to $16.00 on orders with 2 or more items

Constable and Co- Australian Opal specialists in the Opal and Gem industry since 1980s
Woodford, Australia
4128 Feedback

  • johnn0

    Very nice.

  • sizzle7

    Thanks very much, all arrived safe and sound, well packaged and good service. 4 nice pear shaped doublets exactly as pictured.

  • razorlight

    received today and i'm very pleased, thank you

  • yakness

    Nice stone, received with thanks

Coupon code C&C024
Valid Until
22nd Feb 2024


The Opal Sheriff program allows our members to request an audit on any product, which is completed by an independent Gemologist who assesses the accuracy of the item description and pictures.

Shipping Details

$16.00 24 days via Standard Shipping - Tracked
Ships from:

Payment Options

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This seller adds 10.00% tax to transactions in Australia.


Listing Type : Standard
Product ID : 1283000
Starts : 14th February 2024 01:28 pm PST
* All prices are in USD