Koroit Boulder Opal Stone
This 27.53ct Natural Koroit Boulder Opal from Koroit, QLD showcases a classic, richly patterned ironstone matrix with glowing blue veins peeking through its polished surface. Its oval shape and smooth double-sided finish make it a versatile piece for custom settings or collectors who admire intricate matrix formation and understated opal fire.
✨ Features & Benefits:
✨ 100% Natural Boulder Opal – Untreated and ethically sourced from Koroit, Australia
✨ Earthy Brown Matrix – Iconic Koroit swirls with subtle natural opal inclusions
✨ Blue Veins – Hints of opal fire glow through the matrix pattern
✨ Oval Shape – Balanced for pendants or stone collectors
✨ Double Sided Polish – Smooth and display-ready on both faces
✨ October Birthstone – A beautiful and meaningful gem for gifting or collecting
Read more about Koroit Opals
Watch more opals on our YouTube Channel
About Boulder Opals
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
Please be aware that slight color variations in our opals may occur due to differences in screen configurations.
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.
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.
Double Sided Oval Koroit Boulder Opal Stone 27.53 ct
USD 85
Natural Solid Untreated Boulder Opal Polished Stone
Weight: 27.53 ct
Dimensions: 23.5×20.5×5 mm
Source: Koroit, QLD, Australia
(Size and weight are approximate)
In stock
Koroit Boulder Opal Stone
This 27.53ct Natural Koroit Boulder Opal from Koroit, QLD showcases a classic, richly patterned ironstone matrix with glowing blue veins peeking through its polished surface. Its oval shape and smooth double-sided finish make it a versatile piece for custom settings or collectors who admire intricate matrix formation and understated opal fire.
✨ Features & Benefits:
✨ 100% Natural Boulder Opal – Untreated and ethically sourced from Koroit, Australia
✨ Earthy Brown Matrix – Iconic Koroit swirls with subtle natural opal inclusions
✨ Blue Veins – Hints of opal fire glow through the matrix pattern
✨ Oval Shape – Balanced for pendants or stone collectors
✨ Double Sided Polish – Smooth and display-ready on both faces
✨ October Birthstone – A beautiful and meaningful gem for gifting or collecting
Read more about Koroit Opals
Watch more opals on our YouTube Channel
About Boulder Opals
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
Please be aware that slight color variations in our opals may occur due to differences in screen configurations.
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.
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.
