Natural dark opal rainbow fire 2.78 ct close up showing rolling rainbow fire on a dark base.
Natural dark opal rainbow fire 2.78 ct showing bright rainbow colors across the oval face.
Natural dark opal rainbow fire 2.78 ct resting on fingers to show size and proportions.
Natural dark opal rainbow fire 2.78 ct held between fingers highlighting strong multicolor fire.
Natural dark opal rainbow fire 2.78 ct angled side view revealing early flashes of color.
Natural dark opal rainbow fire 2.78 ct side view showing polished thickness and clean edges.
Natural dark opal rainbow fire 2.78 ct showing a smooth polished back and dark body tone.
Natural dark opal rainbow fire 2.78 ct displaying intense red green and blue color play.

Rainbow Fire Prism Oval Dark Opal

2.78ct Natural Dark Opal, also referred to as a semi black opal, is a striking gemstone cut into a smooth, symmetrical oval. Sourced from the opal-rich grounds of Lightning Ridge, Australia, this stone boasts a high-energy fire in a rainbow of hues neon red, green, orange, yellow, and blue.

With a dark body tone that enhances the contrast of its play-of-color, this opal reflects brilliantly from every angle. Its polished cabochon surface is ideal for professional jewelers, custom designers, or collectors looking to add brilliance and rarity to their gemstone collection.

This opals balance of size, color saturation, and clarity makes it perfect for elegant statement rings, heirloom-quality pendants, or fine custom jewelry.

A true representation of Australia's opal legacy, this 2.78ct gem is not only beautiful its timeless.

Features & Benefits:
Natural Solid Dark Opal 100% untreated and ethically sourced from Lightning Ridge
Metallic Opal Fire Includes red, green, blue, orange, and yellow
Polished Oval Cabochon Cut for maximum brightness and balance
Premium Collector Quality Ideal for jewelry designers and gemstone lovers
October Birthstone A gem linked to emotional balance, passion, and creativity

Socials

Follow the Opal Galaxy Facebook page
Subscribe to the Opal Galaxy YouTube page
Check Opal Galaxy Pinterest page

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.

Add to Wishlist

2.78ct Natural Dark Opal – Oval Rainbow Fire

AU$3,994

In stock

Details

Dimension:

14ร—8ร—3.2 mm

Weight:

2.78ct

Type:

Natural Solid Untreated Dark Opal

Source:

Lightning Ridge, NSW, Australia

Sku:

XX1344

Rainbow Fire Prism Oval Dark Opal

2.78ct Natural Dark Opal, also referred to as a semi black opal, is a striking gemstone cut into a smooth, symmetrical oval. Sourced from the opal-rich grounds of Lightning Ridge, Australia, this stone boasts a high-energy fire in a rainbow of hues neon red, green, orange, yellow, and blue.

With a dark body tone that enhances the contrast of its play-of-color, this opal reflects brilliantly from every angle. Its polished cabochon surface is ideal for professional jewelers, custom designers, or collectors looking to add brilliance and rarity to their gemstone collection.

This opals balance of size, color saturation, and clarity makes it perfect for elegant statement rings, heirloom-quality pendants, or fine custom jewelry.

A true representation of Australia's opal legacy, this 2.78ct gem is not only beautiful its timeless.

Features & Benefits:
Natural Solid Dark Opal 100% untreated and ethically sourced from Lightning Ridge
Metallic Opal Fire Includes red, green, blue, orange, and yellow
Polished Oval Cabochon Cut for maximum brightness and balance
Premium Collector Quality Ideal for jewelry designers and gemstone lovers
October Birthstone A gem linked to emotional balance, passion, and creativity

Socials

Follow the Opal Galaxy Facebook page
Subscribe to the Opal Galaxy YouTube page
Check Opal Galaxy Pinterest page

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.

You may also like

Recently Viewed

Reviews