Gem Rainbow Boulder Opal 55.3 ct
100% Natural Solid Untreated Australian Boulder Opal Polished Stone
Weight: 55.3 ct
Source: Duck Creek, Qld, Australia
Size and weight are approximate
Gem Rainbow Boulder Opal
Shine Bright Multi Color Fire, Large Oval Shape, Top Polished.
This Gem Rainbow Boulder Opal has a full face of multi color. This means there is no break in color with ironstone showing.
Other Boulder mining regions rival this level of quality boulder. Such a large piece of full-face Opal like this is very hard to discover. Especially from this infamous region known for its great quality of opal. This is a true collectors opal that is very hard to even find on the market.
This Gem Rainbow Boulder Opal is an ideal addition to your collection or make into stunning opal jewelry.
Mined in Duck Creek, Queensland, Australia
This Gem Rainbow Boulder Opal discovery was in Duck Creek, Queensland in the 1980’s.
Mining efforts in Duck Creek mostly ceased a long time ago.
Only recently some miners have gone back to old mine sites however not much has been found.
Duck Creek is host to one of the few places that anyone can legally go and fossick above ground for free.
Watch Geoff from the Brisbane Opal Museum explain where to do this here: https://www.instagram.com/reel/Cu3yJ2OR13j/?igshid=MzRlODBiNWFlZA%3D%3D&fbclid=IwAR38EAwT_J0rpMRrzZ6ISKtZJ55KfXQ53E0fKr0iZV5J7kEr5_EQcR7vhOE
The formation of Opal
Did you know that Opals such as this Gem Rainbow Boulder Opal are a stunning type of gemstone formed by a chemical reaction between silicon dioxide and water? As water moves through the earth, it picks up silica from sandstone and carries it into cracks and voids, which form naturally or through decomposing fossils. Once the water evaporated, it left behind a silica deposit. Over time, these deposits have transformed into the stunning and lustrous rocks we call Australian Opals.
It’s fascinating to note that Opal discoveries are from a vast inland lake that once covered the Australian desert.
Read more about Opal formations
Watch more opals on our YouTube Channel
Size and weight are approximate.
Please check the provided weight and dimensions carefully.
We are unable to offer additional photos for size reference.
We recommend drawing the dimensions on paper for size reference of an opal.
Registered Shipping $15 under $200
Free Registered Shipping over $201
Free Worldwide EMS Express Shipping over $1000
Free Worldwide FedEx Shipping over $6500
Extra Cost $25 EMS Shipping Upgrade under $200
Extra Cost $10 EMS Shipping Upgrade under $999
Extra Cost $100 FedEx Shipping Upgrade under $6499
All shipping includes complimentary insurance.
Please view our Shipping Policy page for more information.
7 day return and refund policy.
Please view our Return and Refund page for more information.
Australian Opals do not change their appearance after exposure to heat / climate / humidity / water.
An Australian Opal will not be damaged when exposed to light chemicals such as dishwashing detergent or hand soap. You should not however expose your opal to hasher chemicals such as bleach or ammonia.
They are however susceptible to cracking if knocked hard enough. If wearing your opal set in a ring you should always be careful that it is not knocked during physical activities.
If undertaking some form of sport or manual labour, please take off your ring or other opal jewelry so that it is not damaged.
Boulder Opal is a beautiful type of precious opal that is unique to Queensland, Australia. Boulder Opal is usually found in Ironstone, but sometimes found in sandstone which is referred to as Pipe Boulder Opal or Crystal Opal. Boulder opal is popularly used in pendant necklace designs, as well as in rings by jewelers around the world. Read more here about boulder opals