Loose Boulder Opal Cabochons for Jewelry Making
Loose boulder opal cabochons for jewelry making - sourced from the rugged opal fields of Queensland, Australia - offering endless creative possibilities for artisans and jewelry makers.
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Bi-color
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Black
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Blue
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Brown
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Golden
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Gray
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Green
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Multicolor Loose Boulder Opal Cabochons for Jewelry Making
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Orange
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Pink
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Purple
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Red
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Turquoise
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Violet
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White
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Yellow
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Single |
Pairs |
Lots |
Faceted |
Cabochons |
9.18ct Multicolor Boulder Opal, Cushion, Opaque
16.7 x 9.6 mm
$ 55.08
6.97ct Multicolor Boulder Opal, Cushion, Opaque
19.2 x 10.7 mm
$ 41.82
11.36ct Multicolor Boulder Opal, Pear Shape, Opaque
26.3 x 13.8 mm
$ 68.16
8.01ct Multicolor Boulder Opal, Cushion, Opaque
15.6 x 8.8 mm
$ 67.28
8.32ct Multicolor Boulder Opal, Pear Shape, Opaque
18.8 x 10.2 mm
$ 69.89
7.10ct Multicolor Boulder Opal, Oval, Opaque
21.2 x 10.1 mm
$ 59.64
10.68ct Multicolor Boulder Opal, Fancy, Opaque
20.1 x 16.5 mm
$ 64.08
5.70ct Multicolor Boulder Opal, Oval, Opaque
15 x 10 mm (calibrated)
$ 28.50
12.51ct Multicolor Boulder Opal, Fancy, Opaque
23.5 x 14.3 mm
$ 75.06
17.61ct Multicolor Boulder Opal, Fancy, Opaque
22.8 x 17.7 mm
$ 105.66
33.93ct Multicolor Boulder Opal, Trillion, Opaque
26.7 x 21.3 mm
$ 269.36
10.36ct Multicolor Boulder Opal, Fancy, Translucent
19.6 x 11.4 mm
$ 62.16
7.48ct Multicolor Boulder Opal, Pear Shape, Opaque
16 x 12 mm (calibrated)
$ 62.83
10.92ct Multicolor Boulder Opal, Fancy, Opaque
22.6 x 12.9 mm
$ 65.52
11.18ct Multicolor Boulder Opal, Pear Shape, Opaque
23.3 x 16.3 mm
$ 73.79
11.60ct Multicolor Boulder Opal, Fancy, Opaque
19.8 x 15.7 mm
$ 69.60
9.35ct Multicolor Boulder Opal, Fancy, Opaque
17.6 x 14.2 mm
$ 56.10
9.26ct Multicolor Boulder Opal, Fancy, Opaque
21.4 x 15.4 mm
$ 77.78
25.02ct Multicolor Boulder Opal, Fancy, Opaque
29.5 x 18.4 mm
$ 210.17
11.65ct Multicolor Boulder Opal, Round, Opaque
17 mm (calibrated)
$ 97.86
16.75ct Multicolor Boulder Opal, Fancy, Opaque
26.6 x 15.3 mm
$ 100.50
40.27ct Multicolor Boulder Opal, Fancy, Opaque
41.4 x 24.3 mm
$ 241.62
17.56ct Multicolor Boulder Opal, Fancy, Opaque
24 x 16.7 mm
$ 105.36
6.10ct Multicolor Boulder Opal, Fancy, Transparent
17 x 11.5 mm
$ 36.60
What Are Boulder Opal Cabochons?
Boulder opal is a unique variety of opal that forms naturally within ironstone or sandstone matrix, creating a durable and grounded base for the opal's signature iridescent play-of-color. Unlike solid opals, boulder opals require at least 5mm of genuine opal to qualify as such, making them more resilient for everyday jewelry. Our loose cabochons are carefully hand-cut to preserve the stone's natural flow and patterns, ensuring each piece tells its own geological story.
- Origin: Primarily from Queensland, Australia, including regions like Quilpie and Winton.
- Formation: Millions of years in the making, often within fossilized wood or ironstone roots for one-of-a-kind patterns.
- Cut Style: Smooth, domed cabochons (non-faceted) to enhance light refraction and color flashes.
Why Choose Boulder Opal for Your Designs?
Boulder opal cabochons are a favorite among jewelry makers for their affordability, durability, and artistic versatility. The ironstone backing adds strength, reducing the risk of cracking compared to thinner solid opals. With water content typically between 6-10%, these stones are more stable in varying climates but still benefit from gentle care.
| Feature | Benefit |
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| Vibrant Color Play | Shimmering flashes of blue, green, gold, and red for eye-catching pieces. |
| Durability | Matrix support makes them ideal for rings and brooches; Mohs hardness 5.5-6.5. |
| Ethical Sourcing | Hand-mined by small family teams in Australia, ensuring sustainable practices. |
| Versatility | Available in sizes from 5x3mm to 30x15mm; freeform or calibrated shapes. |
Care Tips and Symbolic Meaning
To keep your boulder opal cabochons shining, clean with warm soapy water and a soft brush. Avoid harsh chemicals, ultrasonic cleaners, or prolonged dry storage-store in an airtight container with a damp cloth if needed. Symbolically, boulder opals represent grounding energy, creativity, and emotional balance, making them perfect for inspirational jewelry.
"Each boulder opal is a tiny universe captured in stone-unique, resilient, and full of hidden fire."
FAQs
What makes boulder opal cabochons different from other opal types?
Boulder opal cabochons are unique due to their natural ironstone or sandstone matrix, which provides durability and distinctive patterns. Unlike solid opals, they combine a robust backing with vibrant opal color play, making them ideal for jewelry making. They typically have a Mohs hardness of 5.5-6.5, offering greater resistance to wear compared to thinner opals.
Are your boulder opal cabochons ethically sourced?
Yes, our boulder opals are hand-mined from Queensland, Australia, by small family-run operations. We prioritize sustainable and ethical sourcing practices to ensure minimal environmental impact and fair working conditions.
What sizes and shapes of boulder opal cabochons are available?
We offer a variety of sizes ranging from 5x3mm to 30x15mm, available in both freeform and calibrated shapes like ovals, rounds, and teardrops. Each cabochon is hand-cut to highlight its unique color play and natural matrix patterns.
How should I care for my boulder opal cabochons?
To maintain their brilliance, clean boulder opal cabochons with warm soapy water and a soft brush. Avoid harsh chemicals, ultrasonic cleaners, or prolonged dry storage. Store in an airtight container with a damp cloth to prevent dehydration, as they contain 6-10% water content.
Can I use boulder opal cabochons for all types of jewelry?
Absolutely! Their durability makes them suitable for rings, pendants, earrings, and brooches. The ironstone matrix adds strength, but for high-impact pieces like rings, consider protective settings to enhance longevity.
All stones are natural, untreated, and come with a certificate of authenticity.
