91.5ct Solid Boulder Opal Specimen Wood Replacement front view Australian opal gemstone Opal Galaxy product image
91.5ct Solid Boulder Opal Specimen Wood Replacement angled view Australian opal gemstone Opal Galaxy product image
Wood Fossil Boulder Opal Specimen 91.5  ct

Celestial Fossil Prism Rainbow Stardust Within Time

This 91.5ct Boulder Opal Specimen from Winton is a natural wonderan ancient wood replacement fossil glowing with a rare spectrum of rainbow flash. Its captivating lattice-like structure and gem-grade polish highlight the natural fossilization of wood with vibrant blue, green, red, and golden flash. A collector's dream with unmatched beauty and storytelling depth.

Features & Benefits:
Natural Solid Opal Specimen Fossilized wood replacement from Winton, Australia
Rainbow Flash Fire Vivid multicolor shimmer with gem-like sparkle all over
Specimen Collector Grade Rare fossil opal with high display and investment value
91.5ct Size Large and impactful for a statement pendant, collectors showcase, or high-end design
October Birthstone A powerful and symbolic gemstone for collectors and artists alike

Boulder Opal Wood Fossil Replacement (often just called Wood Replacement Boulder Opal) is a type of natural opal that forms when silica-rich water slowly replaces the organic material of ancient wood, molecule by molecule, over millions of years. This rare process fossilizes the wood structure while filling it with vibrant opal.

Key Features:

  • Natural Opal Replacement: The wood is entirely replaced by opal, not just coated.

  • Preserved Wood Texture: You can often see wood grain, rings, or organic textures.

  • Vibrant Play-of-Color: Commonly displays electric blues, greens, or even rare reds and purples.

  • Natural Formation: No two pieces are alike each one tells a geological story from millions of years ago.

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 $80 FedEx Shipping Upgrade under $3999

All shipping includes complimentary insurance.
Please view ourย Shipping Policyย page for more information.

7 day return and refund policy.
Please view ourย Return and Refundย 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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91.5ct Solid Boulder Opal Specimen – Wood Replacement

AU$10,975

In stock

Details

Dimension:

67x31x7 mm

Weight:

91.5 ct

Type:

Natural Solid Untreated Boulder Opal

Source:

Winton, QLD, Australia

Sku:

DD92

Notes

The face of this opal is undulated

Celestial Fossil Prism Rainbow Stardust Within Time

This 91.5ct Boulder Opal Specimen from Winton is a natural wonderan ancient wood replacement fossil glowing with a rare spectrum of rainbow flash. Its captivating lattice-like structure and gem-grade polish highlight the natural fossilization of wood with vibrant blue, green, red, and golden flash. A collector's dream with unmatched beauty and storytelling depth.

Features & Benefits:
Natural Solid Opal Specimen Fossilized wood replacement from Winton, Australia
Rainbow Flash Fire Vivid multicolor shimmer with gem-like sparkle all over
Specimen Collector Grade Rare fossil opal with high display and investment value
91.5ct Size Large and impactful for a statement pendant, collectors showcase, or high-end design
October Birthstone A powerful and symbolic gemstone for collectors and artists alike

Boulder Opal Wood Fossil Replacement (often just called Wood Replacement Boulder Opal) is a type of natural opal that forms when silica-rich water slowly replaces the organic material of ancient wood, molecule by molecule, over millions of years. This rare process fossilizes the wood structure while filling it with vibrant opal.

Key Features:

  • Natural Opal Replacement: The wood is entirely replaced by opal, not just coated.

  • Preserved Wood Texture: You can often see wood grain, rings, or organic textures.

  • Vibrant Play-of-Color: Commonly displays electric blues, greens, or even rare reds and purples.

  • Natural Formation: No two pieces are alike each one tells a geological story from millions of years ago.

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 $80 FedEx Shipping Upgrade under $3999

All shipping includes complimentary insurance.
Please view ourย Shipping Policyย page for more information.

7 day return and refund policy.
Please view ourย Return and Refundย 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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