Boulder Opal Specimen
This 1.6 kilogram boulder opal specimen comes from the Winton opal fields in Queensland, Australia. This large single slab offers exceptional volume and visual interest, ideal for a cutter seeking one major project stone or a collector wanting an impressive standalone display specimen.
The slab is crossed by an intricate network of blue and pale opal veins running through the reddish brown ironstone in branching fracture patterns. Multiple golden concentric eye formations appear across the face of the piece, showing the classic ring banding that forms in certain boulder opal nodules. A wide opal window sits near the top of the slab, showing pale blue and white color running along the natural break line. The lower portion of the piece shows a deeper blue and lavender pocket with strong coverage.
At 1.6 kilograms, this is one of the largest single specimens available, giving a skilled cutter multiple potential cutting zones across the slab. Each of the visible eye formations and veined sections could yield an individual finished cabochon, making this piece capable of producing several stones from one purchase. As a raw specimen, it also stands on its own as a natural showcase of Winton boulder opal formation.
This specimen suits experienced lapidary artists working on a major project, or collectors seeking a substantial centerpiece for their collection.
This opal is 100% natural and completely untreated. It is not a doublet or triplet. Photographs were taken wet under natural sunlight on a phone camera. Dry appearance will differ. Price includes worldwide registered shipping.
This piece will arrive securely packaged in an Opal Galaxy gift box, making it ready for safe storage, jewelry setting, or presentation as a collector gemstone.
Learn about Opal CuttingÂ
Shipping Updates - March 2026
Latest international delivery information from Australia Post and FedEx.
USA TariffÂ
USA customers do not need to pay any tariffs on their purchase. Opal Galaxy covers all tariff charges to the USA, with no additional government fees added after checkout.
Delivery Status
USA: No delays
Asia: No delays
UK: Minor delays possible (Complimentary EMS Express upgrade)
Europe: Minor delays possible (Complimentary EMS Express upgrade)
Middle East: Shipping temporarily suspended - Please contact us to discuss shipping arrangements before purchase.
Shipping Information
All shipping includes complimentary insurance.
Registered Shipping $15 under $200
Free Registered Shipping over $201
Free Worldwide EMS Express Shipping over $1000
Free Worldwide FedEx Shipping over $4000
Extra Cost $25 EMS Shipping Upgrade under $200
Extra Cost $10 EMS Shipping Upgrade under $999
Extra Cost $100 FedEx Shipping Upgrade under $3999
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.
Caring for Your Australian Opal
Opal Jewelry
Important: Opals Are Fragile Gemstones
Opals are softer than sapphires, rubies, or diamonds and will crack or chip if struck hard against solid surfaces.
Always remove opal jewelry before:
Sports or physical activities
Manual labor, gardening, or gym workouts
Household tasks where impact is possible (lifting, moving furniture, etc.)
Even a minor knock during everyday wear can cause permanent damage. Treat opals as delicate gemstones, not everyday workwear.
Cleaning Your Opal
Clean with warm water and mild soap. Avoid harsh chemicals like bleach, ammonia, or chlorine. Light exposure to hand soap or dishwashing detergent is safe.
Storage
Store opal jewelry separately from harder gemstones (diamonds, sapphires) to prevent scratching.
Solid Natural Opals
(Black, Boulder, Crystal, White Opal)
Natural solid opals are stable and won't change color or crack from water, humidity, or temperature changes. They are safe to submerge in water and can be worn daily, provided they are protected from physical impact. Solid opals are a single piece of gemstone with no artificial backing, making them ideal for heirloom quality jewelry when handled with care.
Opal Doublets
Opal doublets consist of a thin slice of natural opal bonded to a dark backing. Do not submerge doublets in water as prolonged exposure can weaken the adhesive bond and cause separation or cloudiness. Remove doublet jewelry before swimming, bathing, or washing dishes. Clean with a damp cloth only; do not soak or use ultrasonic cleaners.
Like all opals, doublets are fragile and must be protected from impact.
Not sure which type you have? Solid opals show natural color throughout the stone. Doublets have a visible dark backing layer when viewed from the side.
Boulder Opal Specimen Rough 1.6kg
AU$245
In stock
Details
|
Dimension: |
See ruler in image |
|
Weight: |
1.6 kilogram total weight |
|
Type: |
Natural Solid Untreated Boulder Opal |
|
Source: |
Winton, QLD, Australia |
|
Sku: |
RP250 |
|
Notes Quantity: 1 piece |
|
| Large Boulder Opal Specimen ideal for cutting. Opal is wet to show color and taken under natural sunlight on a phone camera. Price includes Worldwide registered shipping. | |
Boulder Opal Specimen
This 1.6 kilogram boulder opal specimen comes from the Winton opal fields in Queensland, Australia. This large single slab offers exceptional volume and visual interest, ideal for a cutter seeking one major project stone or a collector wanting an impressive standalone display specimen.
The slab is crossed by an intricate network of blue and pale opal veins running through the reddish brown ironstone in branching fracture patterns. Multiple golden concentric eye formations appear across the face of the piece, showing the classic ring banding that forms in certain boulder opal nodules. A wide opal window sits near the top of the slab, showing pale blue and white color running along the natural break line. The lower portion of the piece shows a deeper blue and lavender pocket with strong coverage.
At 1.6 kilograms, this is one of the largest single specimens available, giving a skilled cutter multiple potential cutting zones across the slab. Each of the visible eye formations and veined sections could yield an individual finished cabochon, making this piece capable of producing several stones from one purchase. As a raw specimen, it also stands on its own as a natural showcase of Winton boulder opal formation.
This specimen suits experienced lapidary artists working on a major project, or collectors seeking a substantial centerpiece for their collection.
This opal is 100% natural and completely untreated. It is not a doublet or triplet. Photographs were taken wet under natural sunlight on a phone camera. Dry appearance will differ. Price includes worldwide registered shipping.
This piece will arrive securely packaged in an Opal Galaxy gift box, making it ready for safe storage, jewelry setting, or presentation as a collector gemstone.
Learn about Opal CuttingÂ
Shipping Updates - March 2026
Latest international delivery information from Australia Post and FedEx.
USA TariffÂ
USA customers do not need to pay any tariffs on their purchase. Opal Galaxy covers all tariff charges to the USA, with no additional government fees added after checkout.
Delivery Status
USA: No delays
Asia: No delays
UK: Minor delays possible (Complimentary EMS Express upgrade)
Europe: Minor delays possible (Complimentary EMS Express upgrade)
Middle East: Shipping temporarily suspended - Please contact us to discuss shipping arrangements before purchase.
Shipping Information
All shipping includes complimentary insurance.
Registered Shipping $15 under $200
Free Registered Shipping over $201
Free Worldwide EMS Express Shipping over $1000
Free Worldwide FedEx Shipping over $4000
Extra Cost $25 EMS Shipping Upgrade under $200
Extra Cost $10 EMS Shipping Upgrade under $999
Extra Cost $100 FedEx Shipping Upgrade under $3999
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.
Caring for Your Australian Opal
Opal Jewelry
Important: Opals Are Fragile Gemstones
Opals are softer than sapphires, rubies, or diamonds and will crack or chip if struck hard against solid surfaces.
Always remove opal jewelry before:
Sports or physical activities
Manual labor, gardening, or gym workouts
Household tasks where impact is possible (lifting, moving furniture, etc.)
Even a minor knock during everyday wear can cause permanent damage. Treat opals as delicate gemstones, not everyday workwear.
Cleaning Your Opal
Clean with warm water and mild soap. Avoid harsh chemicals like bleach, ammonia, or chlorine. Light exposure to hand soap or dishwashing detergent is safe.
Storage
Store opal jewelry separately from harder gemstones (diamonds, sapphires) to prevent scratching.
Solid Natural Opals
(Black, Boulder, Crystal, White Opal)
Natural solid opals are stable and won't change color or crack from water, humidity, or temperature changes. They are safe to submerge in water and can be worn daily, provided they are protected from physical impact. Solid opals are a single piece of gemstone with no artificial backing, making them ideal for heirloom quality jewelry when handled with care.
Opal Doublets
Opal doublets consist of a thin slice of natural opal bonded to a dark backing. Do not submerge doublets in water as prolonged exposure can weaken the adhesive bond and cause separation or cloudiness. Remove doublet jewelry before swimming, bathing, or washing dishes. Clean with a damp cloth only; do not soak or use ultrasonic cleaners.
Like all opals, doublets are fragile and must be protected from impact.
Not sure which type you have? Solid opals show natural color throughout the stone. Doublets have a visible dark backing layer when viewed from the side.
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