Koroit Boulder Opal
This impressive 146.94ct Natural Boulder Opal from Koroit, Australia is a showpiece featuring dramatic, high-contrast matrix lines over a warm golden honey background. Vivid veins of opal fire—ranging from green to hints of orange and blue—peek through the swirls, giving it a mesmerizing visual depth. The large polished freeform surface and rounded contours highlight its naturally bold patterning, making it an ideal collector’s stone or luxury statement piece.
✨ Features & Benefits:
✨ 100% Natural Solid Boulder Opal – Ethically sourced from Koroit, QLD, Australia
✨ Striking Honey Matrix – Rich swirls in earthy caramel and brown tones
✨ Vibrant Opal Veins – Glimpses of green, blue, and red fire throughout
✨ Substantial Size – 146.94ct, ideal for collectors or bespoke display jewelry
✨ October Birthstone – A meaningful and powerful gift option
✨ One-of-a-Kind Artistry – Koroit opals are celebrated for their intricate, nature-formed patterns
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.
146.94ct Large Natural Koroit Boulder Opal
AU$765
100% Natural Polished Boulder Opal
Weight: 146.94 ct
Dimensions: 39x30x13 mm
Source: Koroit,QLD, Australia
In stock
Koroit Boulder Opal
This impressive 146.94ct Natural Boulder Opal from Koroit, Australia is a showpiece featuring dramatic, high-contrast matrix lines over a warm golden honey background. Vivid veins of opal fire—ranging from green to hints of orange and blue—peek through the swirls, giving it a mesmerizing visual depth. The large polished freeform surface and rounded contours highlight its naturally bold patterning, making it an ideal collector’s stone or luxury statement piece.
✨ Features & Benefits:
✨ 100% Natural Solid Boulder Opal – Ethically sourced from Koroit, QLD, Australia
✨ Striking Honey Matrix – Rich swirls in earthy caramel and brown tones
✨ Vibrant Opal Veins – Glimpses of green, blue, and red fire throughout
✨ Substantial Size – 146.94ct, ideal for collectors or bespoke display jewelry
✨ October Birthstone – A meaningful and powerful gift option
✨ One-of-a-Kind Artistry – Koroit opals are celebrated for their intricate, nature-formed patterns
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.
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