27.53ct Koroit Boulder Opal Matrix Double Sided front face view Australian opal gemstone Opal Galaxy product image
27.53ct Koroit Boulder Opal Matrix Double Sided angled view Australian opal gemstone Opal Galaxy product image
27.53ct Koroit Boulder Opal Matrix Double Sided back view Australian opal gemstone Opal Galaxy product image
27.53ct Koroit Boulder Opal Matrix Double Sided detail view Australian opal gemstone Opal Galaxy product image
27.53ct Koroit Boulder Opal Matrix Double Sided detail view Australian opal gemstone Opal Galaxy product image
27.53ct Koroit Boulder Opal Matrix Double Sided detail view Australian opal gemstone Opal Galaxy product image
27.53ct Koroit Boulder Opal Matrix Double Sided detail view Australian opal gemstone Opal Galaxy product image

This 27.53ct solid Australian Koroit boulder opal was mined from Queenslandโ€™s renowned fields, known for producing opals with remarkable matrix structure and earthy elegance.
The stone reveals intricate ironstone patterns interlaced with natural opal veins, polished to a smooth glossy finish.

Completely natural and untreated, this opal showcases the authenticity and artistry of Australian gemstone formation.
Its oval cabochon shape makes it ideal for custom jewelry designs such as statement rings or pendants, or as a collectorโ€™s centerpiece.

Boulder opals are prized for their strength, depth, and natural matrix beauty that glows subtly under light.
As an opal October birthstone, this gem embodies creativity, emotional balance, and passion, making it a meaningful choice for fine jewelry and symbolic gifts.

This stunning opal will arrive securely packaged in an Opal Galaxy gift box, making it ready for safe storage, jewelry setting, or presentation as a collector gemstone.

Read more about Koroit Opals
Watch more opals on our YouTube Channel

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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27.53ct Koroit Boulder Opal Matrix Double Sided

AU$121

In stock

Details

Dimension:

23.5x20.5x5 mm

Weight:

27.53 ct

Type:

Natural Solid Untreated Boulder Opal

Source:

Koroit, QLD, Australia

Sku:

KK18

This 27.53ct solid Australian Koroit boulder opal was mined from Queenslandโ€™s renowned fields, known for producing opals with remarkable matrix structure and earthy elegance.
The stone reveals intricate ironstone patterns interlaced with natural opal veins, polished to a smooth glossy finish.

Completely natural and untreated, this opal showcases the authenticity and artistry of Australian gemstone formation.
Its oval cabochon shape makes it ideal for custom jewelry designs such as statement rings or pendants, or as a collectorโ€™s centerpiece.

Boulder opals are prized for their strength, depth, and natural matrix beauty that glows subtly under light.
As an opal October birthstone, this gem embodies creativity, emotional balance, and passion, making it a meaningful choice for fine jewelry and symbolic gifts.

This stunning opal will arrive securely packaged in an Opal Galaxy gift box, making it ready for safe storage, jewelry setting, or presentation as a collector gemstone.

Read more about Koroit Opals
Watch more opals on our YouTube Channel

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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