This 20.75ct natural solid crystal boulder opal from Queensland displays soft green and pastel fire across its translucent natural body. This substantial gemstone combines crystal transparency with sandstone backing, creating a gentle effect where delicate color appears to shimmer within the stone. The generous size combined with unique triangular shape makes this piece a distinctive choice for statement jewelry with natural appeal.
Expertly cut and polished into a triangular cabochon measuring 19.9 x 18.7 x 8.9 mm, this natural gemstone offers bold proportions perfect for eye catching designs. The translucent quality allows light to pass through, creating soft depth that changes throughout the day. This substantial size works beautifully for large sterling silver pendants where the stone can be the focal point, or set in yellow gold or bronze for warm, bohemian style statement rings. The unique triangular shape adds geometric interest that works well for contemporary jewelry designs or artisan pieces that emphasize natural beauty and organic form.
Completely natural and untreated, this is genuine solid Australian crystal boulder opal, not a doublet or triplet. The authentic Queensland origin guarantees you are receiving a natural gemstone with sandstone backing that crystal boulder opals are known for. At over 20 carats, this stone offers impressive presence while maintaining the translucent character of the crystal type. The substantial 8.9mm depth provides excellent structure for secure settings in both pendants and rings designed for occasional wear.
As the official October birthstone, this natural gemstone carries symbolic meanings of creativity, passion, and inspiration. The soft pastel fire creates a peaceful, natural aesthetic perfect for statement jewelry that emphasizes size and unique shape. This accessible stone offers impressive visual impact at a friendly price point.
This natural crystal boulder opal will arrive securely packaged in an Opal Galaxy luxury gift box, ready for professional jewelry setting or safe storage.
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.
20.75ct Crystal Boulder Opal
AU$1,678
In stock
Details
|
Dimension: |
19.9 × 18.7 × 8.9 mm |
|
Weight: |
20.75ct |
|
Type: |
Natural Solid Untreated Crystal Boulder Opal |
|
Source: |
Winton, QLD, Australia |
|
Sku: |
XX1895 |
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