Gem Rainbow Boulder Opal 55.3 ct
Gem Rainbow Boulder Opal 55.3 ct
Gem Rainbow Boulder Opal 55.3 ct
Gem Rainbow Boulder Opal 55.3 ct
Gem Rainbow Boulder Opal 55.3 ct
Gem Rainbow Boulder Opal 55.3 ct
Gem Rainbow Boulder Opal 55.3 ct
Gem Rainbow Boulder Opal 55.3 ct

Gem Rainbow Boulder Opal 55.3 ct

USD $25,000

In stock

Natural Solid Untreated Australian Boulder Opal Polished Stone
Weight: 55.3 carats
Dimensions: 55×15.5×6.5mm
Source: Duck Creek, Qld, Australia
Size and weight are approximate

Gem Rainbow Boulder Opal 

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 however 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:

This Gem Rainbow Boulder Opal has a full face of 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.

The formation of Opal

Did you know that Opals such as this Gem Rainbow Boulder Opal are a stunning type of gemstone formation 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.

You can learn more about Opal formations here:

This Gem Rainbow Boulder Opal is an ideal addition for your collection, or to make into a stunning pendant necklace.


To begin with, follow the Opal Galaxy facebook page here

In addition, you can subscribe to the Opal Galaxy youtube page here

Finally, check Opal Galaxy Pinterest page here

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.

FREE Worldwide EMS Express shipping over $1000
FREE Worldwide FedEx shipping over $6500
Add $10 for EMS Shipping Upgrade under $999
Add $100 for 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.

We offer a lifetime guarantee for natural cracks that may form in our opals. There is a very low chance that this can happen, however occasionally it might. Our guarantee excludes any opals sold with existing fractures.
Please view our Terms and Conditions.

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


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Gem Rainbow Boulder Opal 55.3 ct

Gem Rainbow Boulder Opal 55.3 ct

USD $25,000

In stock

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