Opal Brightness Explained
Opal brightness is graded on the B1–B5 scale, where B1 is very dim and B5 is vivid and intense.
Georgie's Gem Studio
Matrix Boulder Opal Necklace – Multi-Colour Pinfire
Matrix Boulder Opal Necklace – Multi-Colour Pinfire
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The Waterhole Expanse - A matrix boulder opal patterned with intricate swirls and tiny colour pools, its blue, green and purple pinfire glimmering like scattered waterholes across a vast sunlit landscape seen from above.
This striking matrix‑conglomerate boulder opal necklace shows a lively mix of blue, green and purple pinfire across its polished rectangular surface.
With brightness 4, the colours sparkle clearly as the stone moves, creating a vivid, eye‑catching shimmer.
The natural matrix pattern gives it a textured, mosaic‑like look, while the double‑sided finish means it’s beautiful from every angle.
Smooth, slim and lightweight, it’s an easy everyday pendant with a bold artisan feel. Finished on an adjustable leather cord and sourced directly from the miner, this is a unique Australian opal full of character and colour.
- Opal Type: Boulder Opal
- Format: Solid
- Colour: Blue, Green, Purple
- Pattern: Pinfire (matrix conglomerate)
- Shape: Rectangle
- Finish: Polished
- Brightness: B4 (of 5)
- Stone Dimensions: 35 × 12 × 3 mm
- Weight: 7 g
- Back: Double‑sided
- Fitting: Leather cord (adjustable)
- Source: Miner‑direct
- Origin: Boulder Opal Fields, Queensland, Australia
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About Our Opals
Every stone is natural, untreated, and individually cut.
No two opals are ever the same - each piece is one‑of‑a‑kind. We source directly from a small Australian mining family, from ethical and regulated opal fields.All photos are taken with a macro lens, remember to check the opal dimensions before purchasing.
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Why Buy From Us
We only work with Australian opals. Every opal is sourced directly from a small‑scale Australian mining family who work with integrity, fairness, and respect for the land. Ethical sourcing and environmental responsibility matters to us.
We want you to be delighted with every purchase, so please read our policies or contact us if you want to find out more:
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Opal Brightness Guide
Judging brightness