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 (Double‑Sided, Leather Cord)
Matrix Boulder Opal Necklace – Multi‑Colour Pinfire (Double‑Sided, Leather Cord)
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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 Australia
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About Our Opals
We only work with Australian opals, direct from #MinerToMaker.
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 small Australian miners and cutters.
Every opal comes from Queensland’s ethical, regulated opal fields.
All photos are taken with a macro lens, remember to check the opal dimensions before purchasing.
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Ethical Opal Sourcing
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Caring for Australian Opal
A simple guide -
Opal Brightness Guide
Judging brightness