Natural faceted crystal opal 3.91 ct square cut close view showing blue fire and bright facet reflections.
Natural faceted crystal opal 3.91 ct square cut held in fingers showing blue fire and clean facet edges.
Side view of the natural faceted crystal opal 3.91 ct square cut held in fingers showing the stone depth and sparkle.
Natural faceted crystal opal 3.91 ct square cut on fingertips to show size with blue fire and warm flashes.
Natural faceted crystal opal 3.91 ct square cut held with tweezers showing blue fire and sharp facet corners.
Natural faceted crystal opal 3.91 ct square cut on a black background showing strong blue fire with bright facet shine.
Natural faceted crystal opal 3.91 ct square cut on a black background showing deep blue fire with clear facets.

This rare 3.91ct natural faceted crystal opal from Andamooka is a stunning example of artisan lapidary. With its bold square silhouette and symmetrical multi-facet design, this gem flashes deep indigo and lavender hues, complemented by golden undertones. The precision faceting enhances its brilliance and fire, making it ideal for luxury rings or bespoke art jewelry.

Features & Benefits:

  • Rare Faceted Cut โ€“ Uncommon style for opal, maximizing brilliance
  • Solid & Untreated โ€“ 100% natural Andamooka opal
  • Deep Violet Fire โ€“ Set against a milky crystal base with flashes of gold
  • Collector's Choice โ€“ Highly desirable for both rarity and craftsmanship
  • Ideal Size โ€“ 11mm face for standout yet wearable design
  • October Birthstone โ€“ Celebrated for passion, creativity, and intuition

Read our Blogs to learn more about Opals
Watch more of our opals on YouTube

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.

Add to Wishlist

3.91ct Natural Faceted Crystal Opal

AU$1,407

In stock

Details

Dimension:

11x11x6.2 mm

Weight:

3.91 ct

Type:

Natural Solid Untreated Crystal Opal

Source:

Andamooka, SA, Australia

Sku:

XX1593

This rare 3.91ct natural faceted crystal opal from Andamooka is a stunning example of artisan lapidary. With its bold square silhouette and symmetrical multi-facet design, this gem flashes deep indigo and lavender hues, complemented by golden undertones. The precision faceting enhances its brilliance and fire, making it ideal for luxury rings or bespoke art jewelry.

Features & Benefits:

  • Rare Faceted Cut โ€“ Uncommon style for opal, maximizing brilliance
  • Solid & Untreated โ€“ 100% natural Andamooka opal
  • Deep Violet Fire โ€“ Set against a milky crystal base with flashes of gold
  • Collector's Choice โ€“ Highly desirable for both rarity and craftsmanship
  • Ideal Size โ€“ 11mm face for standout yet wearable design
  • October Birthstone โ€“ Celebrated for passion, creativity, and intuition

Read our Blogs to learn more about Opals
Watch more of our opals on YouTube

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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