Natural crystal boulder opal 54.18 ct neon green rectangle cabochon on black showing a bright green shimmer across the face.
Natural crystal boulder opal 54.18 ct neon green rectangle on fingers showing bright green color play and smooth dome.
Natural crystal boulder opal 54.18 ct neon green rectangle held in fingers showing the size and bright green color play.
Side view of natural crystal boulder opal 54.18 ct neon green rectangle cabochon showing a long shape and polished edge.
Back view of natural crystal boulder opal 54.18 ct neon green rectangle showing the base and clean polish.
Natural crystal boulder opal 54.18 ct neon green rectangle cabochon on black showing even green color play and glossy finish.

This natural solid Australian crystal opal displays bright green and blue fire across a large translucent body, with strong color movement and depth visible across the surface. The intensity and spread of color create a luminous effect, making it suitable for high end display, a statement gemstone, or a centerpiece stone for custom opal pendant, opal necklace, or fine jewelry.

Jewellery Use

This opal is ideal for custom pendant designs, statement jewelry, or as a large feature stone where size and color presence are the focus. Its elongated freeform shape allows for flexible design options.

October Birthstone

Opal is the birthstone for October, known for its natural play of color and individuality, making it a meaningful gemstone for fine jewelry or gifting.

About Crystal Opal

Crystal opal is valued for its transparency and ability to display light through the stone, enhancing the depth and vibrancy of its color. Stones of this size and clarity are increasingly rare in the market.

Authenticity

100% natural solid Australian opal. No treatments. No doublets or triplets. Not Ethiopian opal.

Certificate available upon request. Authentic & Trusted Opal Certification by Opal Galaxy

About Boulder Opal

Boulder opal forms naturally within ironstone in Queensland, Australia. This natural backing increases durability while enhancing the contrast and brightness of the color, making it highly suitable for both display and jewelry use.


Learn more
: Exploring the Beauty of Winton Boulder Opals | What Makes an Opal Valuable | Australian Opal Buying Guide

Browse all Boulder opals collection or contact us with questions.

Shipping Updates - March 2026

Latest international delivery information from Australia Post and FedEx.

USA Tariffย 

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 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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Crystal Boulder Opal 54.18ct

AU$18,445

In stock

Details

Dimension:

39.5x18x9 mm

Weight:

54.18ct

Type:

Natural Solid Untreated Crystalย Boulderย Opal

Source:

Winton, QLD, Australia

Sku:

PP83

This natural solid Australian crystal opal displays bright green and blue fire across a large translucent body, with strong color movement and depth visible across the surface. The intensity and spread of color create a luminous effect, making it suitable for high end display, a statement gemstone, or a centerpiece stone for custom opal pendant, opal necklace, or fine jewelry.

Jewellery Use

This opal is ideal for custom pendant designs, statement jewelry, or as a large feature stone where size and color presence are the focus. Its elongated freeform shape allows for flexible design options.

October Birthstone

Opal is the birthstone for October, known for its natural play of color and individuality, making it a meaningful gemstone for fine jewelry or gifting.

About Crystal Opal

Crystal opal is valued for its transparency and ability to display light through the stone, enhancing the depth and vibrancy of its color. Stones of this size and clarity are increasingly rare in the market.

Authenticity

100% natural solid Australian opal. No treatments. No doublets or triplets. Not Ethiopian opal.

Certificate available upon request. Authentic & Trusted Opal Certification by Opal Galaxy

About Boulder Opal

Boulder opal forms naturally within ironstone in Queensland, Australia. This natural backing increases durability while enhancing the contrast and brightness of the color, making it highly suitable for both display and jewelry use.


Learn more
: Exploring the Beauty of Winton Boulder Opals | What Makes an Opal Valuable | Australian Opal Buying Guide

Browse all Boulder opals collection or contact us with questions.

Shipping Updates - March 2026

Latest international delivery information from Australia Post and FedEx.

USA Tariffย 

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 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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