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1.47ct Crystal Boulder Opal
AU$3561.47ct Australian crystal opal with soft blue and green fire polished oval cabochon. 100% Natural and untreated, ideal for fine opal jewelry, ring settings, and October birthstone gifts.
Type: Natural solid crystal opal gemstone
Origin: Australia
Dimensions: 11.7 x 7.5 x 2.8 mm
Weight: 1.47ct
Color: Soft blue and green fire
Cut/Shape: Oval cabochon
Treatment: 100 percent natural, untreated, not a doublet or triplet
2.26ct Crystal Boulder Opal
AU$4202.26ct Australian crystal opal features pastel green and blue fire with soft lavender undertones. Expertly polished in a freeform shape, it is ideal for rings, pendants, and fine October birthstone jewelry. Natural and untreated, perfect for custom design or a collector gemstone.
Type: Natural solid crystal opal
Origin: Queensland Australia
Dimensions: 15 x 7.9 x 3 mm
Weight: 2.26ct
Color: Pastel green and blue fire with lavender and peach body
Cut/Shape: Freeform polished cabochon
Treatment: 100 percent natural untreated opal not a doublet or triplet
Use: Ring, pendant, fine jewelry, October birthstone
2.04ct Crystal Boulder Opal
AU$4992.04ct Australian crystal boulder opal showing bright flashes of orange, yellow, and green across its pastel translucent body. 100% natural and untreated gemstone ideal for fine jewelry or October birthstone collections.
Type: Natural Solid Crystal Boulder Opal (Pipe Opal)
Origin: Queensland, Australia
Dimensions: 15 × 7.2 × 3 mm (approx.)
Weight: 2.04 ct (approx.)
Color: Orange, yellow, green fire
Cut/Shape: Freeform teardrop cabochon
Treatment: 100% natural, untreated opal (not a doublet or triplet)
3.83ct Crystal Boulder Opal
AU$5993.83ct Australian crystal boulder opal showing brilliant green fire with purple body. Natural and untreated gemstone perfect for fine jewelry or October birthstone collections.
Type: Natural Solid Crystal Boulder Opal (Pipe Opal)
Origin: Queensland, Australia
Dimensions: 13.8 × 8.4 × 4.7 mm (approx.)
Weight: 3.83 ct (approx.)
Color: Brilliant green and blue fire with pink undertones
Cut/Shape: Oval cabochon
Treatment: 100% natural, untreated opal (not a doublet or triplet)
3.29ct Crystal Opal
AU$3923.29ct Australian crystal opal with green fire and soft lavender tones. Solid natural untreated gemstone ideal for fine jewelry or October birthstone jewelry setting.
Dimensions: 15.2 × 9.9 × 3.8 mm approx
Weight: 3.29 ct
Origin: Queensland Australia
Opal Type: Natural Solid Crystal Opal
Shape: Freeform triangular cabochon
Treatment: 100% natural untreated opal
1.1ct Crystal Boulder Opal
AU$5991.1ct Australian crystal opal bright green fire with vivid lavender-blue. 100% Natural and untreated gemstone ideal for fine jewelry or October birthstone collectors.
Type: Natural Solid Crystal Opal (Crystal Boulder Opal)
Origin: Queensland, Australia
Dimensions: 10.5 × 7.5 × 2.6 mm (approx.)
Weight: 1.1 ct (approx.)
Color: Green fire with lavender-blue tone (appears magenta in camera)
Cut/Shape: Teardrop cabochon
Treatment: 100% natural, untreated opal (not a doublet or triplet)
4.45ct Crystal Boulder Opal
AU$1,3544.45ct Australian crystal boulder opal featuring vibrant green and blue fire across a translucent body. Natural and untreated, ideal for high-end jewelry, collectors, or October birthstone gifts.
Type: Natural Solid Crystal Opal
Origin: Queensland, Australia
Dimensions: 15.7 × 11.1 × 4.7 mm (approx.)
Weight: 4.45 ct (approx.)
Color: Bright green-blue fire on translucent body
Cut/Shape: Teardrop cabochon
Treatment: 100% natural, untreated opal (not a doublet or triplet)
1.95ct Crystal Boulder Opal
AU$5131.95ct Australian crystal opal with smooth pastel purple body tone and elegant elongated cut. 100% natural and untreated gemstone perfect for fine jewelry, October birthstone designs, or collectors.
Type: Natural Solid Crystal Opal
Origin: Queensland, Australia
Dimensions: 17.3 × 6.7 × 3.0 mm (approx.)
Weight: 1.95 ct (approx.)
Color: Soft pastel purple tone (no fire)
Cut/Shape: Long triangle elongated cut
Treatment: 100% natural, untreated opal (not a doublet or triplet)
2ct Crystal Boulder Opal
AU$3922ct Australian crystal opal from Queensland with soft translucent body tone and gentle pastel color. Expertly polished into an oval cabochon, 100% natural and untreated gemstone perfect for fine jewelry, October birthstone gifts, or collectors.
Type: Natural Solid Crystal Opal
Origin: Queensland, Australia
Dimensions: 10.4 × 7.7 × 3.9 mm (approx.)
Weight: 2.0 ct (approx.)
Color: Soft translucent pastel tone
Cut/Shape: Oval cabochon
Treatment: 100% natural, untreated opal (not a doublet or triplet)
6.95ct Crystal Boulder Opal
AU$8846.95ct Australian crystal opal from Queensland displays vibrant purple and blue fire glowing through a translucent honey body. Expertly polished in an oval cabochon shape, this 100% natural and untreated gemstone is perfect for fine jewelry, custom settings, or as an October birthstone collector’s piece.
Type: Natural Solid Crystal Boulder Opal
Origin: Queensland, Australia
Dimensions: 20 × 12.1 × 4.3 mm (approx.)
Weight: 6.95 ct (approx.)
Color: Brilliant purple and blue fire through translucent body
Cut/Shape: Oval cabochon
Treatment: 100% natural, untreated opal (not a doublet or triplet)
20.75ct Crystal Boulder Opal
AU$1,71020.75ct Australian crystal opal with pastel green and pink fire across its translucent body. Expertly polished triangular cabochon perfect for fine jewelry design, opal rings, or October birthstone collections. 100% natural and untreated Australian gemstone.
Type: Natural Solid Crystal Opal Gemstone
Origin: Queensland, Australia
Dimensions: 19.9 × 18.7 × 8.9 mm (approx.)
Weight: 20.75 carats
Color: Pastel green and pink fire with translucent body tone
Cut/Shape: Polished triangular cabochon
Treatment: 100% natural, untreated opal (not a doublet or triplet)
7.2ct Crystal Boulder Opal
AU$5427.2ct Australian Crystal Boulder Opal from Queensland reveals green fire glowing through translucent natural opal body. Expertly polished in oval cabochon cut, 100% natural and untreated, this gemstone is ideal for jewelry design, October birthstone, or collection.
Type: Natural Solid Crystal Boulder Opal
Origin: Queensland, Australia
Dimensions: 15.9 × 12.5 × 5.6 mm (approx.)
Weight: 7.2 carats (approx.)
Color: Green fire through translucent body tone
Cut/Shape: Oval cabochon
Treatment: 100% natural, untreated opal (not a doublet or triplet)
7.22ct Crystal Boulder Opal
AU$1,0697.22ct Australian Crystal Boulder Opal from Queensland displays luminous green fire glowing through its translucent crystal body. Expertly polished and 100% natural, this untreated gemstone is ideal for fine jewelry design or as a meaningful October birthstone collector piece.
Type: Natural Solid Boulder Opal (Boulder Pipe Opal)
Origin: Queensland, Australia
Dimensions: 27.7 × 14.7 × 8.5 mm (approx.)
Weight: 21.34 ct (approx.)
Color: Green and turquoise fire through sandstone matrix
Cut/Shape: Oval cabochon, polished finish
Treatment: 100% natural, untreated opal (not a doublet or triplet)
1.84ct Black Opal Rolling Multicolor Fire
AU$7,0821.1ct natural solid black opal from Lightning Ridge Australia features vivid cherry red, orange, blue, green, and cyan fire across its polished cabochon surface. This untreated gemstone is perfect for October birthstone jewelry, ready to set into a custom engagement ring, pendant, or collector’s piece.
Type: Natural Solid Black Opal, Untreated
Origin: Lightning Ridge, NSW, Australia
Dimensions: 8.3 x 6.8 x 3.1 mm (approx.)
Weight: 1.1 ct (approx.)
Color: Bright cherry red, orange, green, blue, cyan fire with black body tone
Cut/Shape: Oval polished cabochon
Treatment: 100% natural, untreated opal (not a doublet or triplet)
Koroit Boulder Opal Pendant Necklace 32ct
AU$21432ct Australian Boulder Opal pendant necklace from Koroit, Queensland displays bright blue and green fire across its polished ironstone body. Designed with a natural drilled hole and adjustable brown cord, this 100% natural and untreated gemstone necklace is perfect for October birthstone jewelry and meaningful gifts.
Type: Natural Solid Boulder Opal Pendant Necklace
Origin: Koroit, Queensland, Australia
Dimensions: 46 × 10 × 5 mm (approx.)
Weight: 32 ct (approx.)
Color: Blue and green fire within polished brown ironstone
Cut/Shape: Long freeform cabochon with drilled hole
Necklace: Adjustable brown cord, ready to wear
Treatment: 100% natural, untreated opal (not a doublet or triplet)
1.1ct Black Opal Bright Red and Multicolor Fire
AU$6,2701.1ct natural solid black opal from Lightning Ridge Australia features vivid cherry red, orange, blue, green, and cyan fire across its polished cabochon surface. This untreated gemstone is perfect for October birthstone jewelry, ready to set into a custom engagement ring, pendant, or collector’s piece.
Type: Natural Solid Black Opal, Untreated
Origin: Lightning Ridge, NSW, Australia
Dimensions: 8.3 x 6.8 x 3.1 mm (approx.)
Weight: 1.1 ct (approx.)
Color: Bright cherry red, orange, green, blue, cyan fire with black body tone
Cut/Shape: Oval polished cabochon
Treatment: 100% natural, untreated opal (not a doublet or triplet)
1.67ct Natural Black Opal Oval Green Fire
AU$1,7101.67ct solid black opal high dome cabochon from Lightning Ridge Australia. Natural untreated gemstone with bright green fire. Genuine untreated gemstone ideal for fine jewelry rings pendants or collector stone. October birthstone opal cabochon polished and ready to set.
Type: Natural Solid Black Opal (Untreated)
Origin: Lightning Ridge, Australia
Weight: 1.67ct
Dimensions: 10.4 x 6.2 x 3.8 mm
Shape: High Dome Cabochon
Color: Bright green fire on a dark body tone
Treatment: 100% natural, untreated (not a doublet or triplet)
1.81ct Natural Black Opal Chinese Writing Pattern
AU$3,4061.81ct solid black opal from Lightning Ridge Australia with vivid green teal and blue fire in a rare Chinese writing pattern. Investment grade natural untreated gemstone for collectors and fine jewelry.
Type: Natural Solid Black Opal
Origin: Lightning Ridge Australia
Dimensions: 9.3×8.2×3.9 mm approx
Weight: 1.81ct approx
Color: Bright green teal and blue fire with rare Chinese writing pattern
Cut Shape: Freeform cabochon
Treatment: 100 percent natural untreated opal not a doublet or triplet
0.84ct Black Opal Metallic Neon Rainbow Fire
AU$4,9880.84ct Lightning Ridge black opal loose stone with neon red orange yellow green blue fire. Natural untreated polished cabochon for fine jewelry design or collector gemstone.
Type: Natural Solid Black Opal
Origin: Lightning Ridge, Australia
Dimensions: 9.1×7.2×2.1 mm approx
Weight: 0.84ct approx
Color: Neon red, orange, yellow, green, cyan, blue fire
Cut/Shape: Teardrop cabochon
Treatment: 100% natural, untreated opal (not a doublet or triplet)
4.34ct Natural Black Opal Heart Red Fire
AU$8,9784.34ct solid black opal heart from Lightning Ridge Australia showing vivid red fire with hints of blue and green. 100% natural untreated opal, investment grade gem for collectors and fine jewelry.
Type: Natural Solid Black Opal Heart Cabochon
Origin: Lightning Ridge, Australia
Dimensions: 11.1 x 11.9 x 4.8 mm approx
Weight: 4.34 ct approx
Color: Intense vivid red fire with blue and green flashes across a dark body tone
Cut/Shape: Polished heart cabochon
Treatment: 100% natural untreated opal (not a doublet or triplet)
Use: Ready to set in fine jewelry, investment grade gemstone, collector’s stone
Birthstone: October birthstone, symbolizing creativity, passion, and inspiration
Natural Australian Opal
Explore genuine natural Australian opals from the world’s premier opal fields including Lightning Ridge, Queensland, and South Australia. Our collection features stunning black opals with intense color displays, vibrant boulder opals with natural ironstone backing, luminous crystal opals showcasing transparency, and elegant white opals with soft pastel hues. Each opal is ethically sourced, 100 percent natural and untreated, displaying unique play of color with brilliant flashes of red, blue, green, and rainbow patterns that make every stone genuinely irreplaceable.
Shop loose opal gemstones perfect for custom jewelry creation, finished opal rings and pendants in silver, gold, and platinum settings. Whether you are a collector seeking investment quality specimens, a jeweler sourcing premium gemstones, or someone drawn to the mesmerizing beauty of Australian opals, our curated selection delivers exceptional quality, authenticity, and the timeless appeal of Australia’s national gemstone celebrated worldwide as the October birthstone.
Natural Australian Opal FAQs
What is Australian opal?
Australian opal is a precious gemstone formed from silica deposits that displays unique play of color with flashes of blue, green, red, orange, and rainbow hues. Australia produces over 95 percent of the world’s precious opals from mining fields including Lightning Ridge, Queensland, and South Australia, making it the global center for opal production.
What are the different types of Australian opals?
The main types of Australian opals include black opal from Lightning Ridge with dark backgrounds enhancing color displays, boulder opal from Queensland with natural ironstone backing, crystal opal featuring transparency and luminosity, and white opal from South Australia with lighter milky backgrounds and pastel colors.
How do I know if my Australian opal is real?
Real Australian opals display natural play of color that shifts with movement and viewing angle, have irregular patterns unique to each stone, and show depth when examined closely. Doublets and triplets have visible layers when viewed from the side, while solid opals are cut from single pieces. Professional gemological testing can confirm authenticity definitively.
How do I care for my Australian opal jewelry?
Remove opal jewelry before swimming, bathing, or using harsh chemicals. Clean gently with mild soap and lukewarm water using a soft cloth. Avoid extreme temperature changes and prolonged direct sunlight. Store opals separately in soft pouches to prevent scratching from harder gemstones. With proper care, Australian opals remain beautiful for generations.
What is the difference between black opal and white opal?
Black opal features a dark background that makes colors appear more vivid and dramatic, found primarily at Lightning Ridge. White opal has a lighter milky background displaying softer pastel colors, sourced mainly from South Australian fields like Coober Pedy. Both are genuine precious opals with play of color.
Can Australian opals be worn every day?
Yes, Australian opals can be worn daily with reasonable care. Boulder opals are particularly durable due to their natural ironstone backing. Remove opal jewelry during activities involving impacts, chemicals, or extreme temperatures. Rings may require more careful wear than pendants or earrings due to exposure.
Why is Lightning Ridge famous for opals?
Lightning Ridge is famous for producing the world’s finest black opals with exceptional color displays on dark backgrounds. The unique geological conditions in this New South Wales region created over millions of years result in opals found nowhere else on Earth, making Lightning Ridge material highly sought after by collectors worldwide.