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Vintage 9ct Yellow Gold Queensland Koroit Boulder Opal Ring

Sale price$1,130.00 USD

Laybys welcome! Contact Us today to secure your dream piece.
This strikingly beautiful Opal hails from Queensland Australian and is known as a Koroit Opal - see below for history.

A large example she measures approximately 3.3cm x 1.1cm x 6mm and creates such a presence on the finger with not only her finger coverage but her stunning and intricate patterns and colours.

Crafted from 9ct yellow gold throughout the Opal is bezel set, open backed where her colours and pattern can also be seen, to bifurcated flat shoulders and a wide flat shank.

Desirable to say the least this unique ring is a collectors dream.


The Koroit Opal field was discovered in 1897 by Lawrence Rostron, the manager of Tillboroo Sation, Eulo.

Mining continued for a number of years mostly by syndicates until by 1905, digging approximately 150 shafts up to 15 metres deep and 472 metres of drives, finding 300 ounces of medium and 30 ounces of extra fine gem grade Opal with another one and a quarter tons of gem grade matrix.

Koroit Opal field become dormant shortly afterwards, competing with an oversupply of Opal from Whitecliffs (NSW). Some mining resumed in 1927 until the outbreak of the second World War, where Australian Diggers were once again called to arms in service to their nation.

More recent mining events started again in 1972 when the popularity and profitability of the gemstone increased.

Mining in Koroit today done by either open cut large scale mining or some still prefer to underground mine, albeit a little easier utilising electric lighting, jack hammers, diggers,  boggers and mechanical hoists.

Koroit Opal today competes with no gem, it is a stand alone brand of its own with the Koroit field and its unique characters supplying magnificent Opal to opal connoisseurs around the globe.   

Credit -

Koroit Opal - Pronounced ‘Kuh - Royt’
1 @ approximately 3.3cm x 1.1cm x 6mm deep

3.4xm x 1.2cm
Rise - At highest point 7mm
4.0mm wide shank

7.2 Grams

375 For 9ct

N 1/2 or 17.3mm diameter US 7
Can be resized

Very very good preowned condition.  No chips or scratches nor damage to Opal.  No thinning to shank.  Minor marks to gold only.

Please note boxes are for display only unless otherwise stated.