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
Yowah Boulder Opal Rub – Full‑Face Purple Flash (Ready for Polishing)
Yowah Boulder Opal Rub – Full‑Face Purple Flash (Ready for Polishing)
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The Violet Hour - Just before nightfall, the last light spills violet across the world, waking tiny sparks in the gathering dusk. Here, that fleeting hour lingers, a little wild and unfinished, unwilling to let its glow fade.
This stunning Yowah boulder opal rub displays a rich full‑face spread of vibrant blue/purple colour across the surface, making it an exciting piece for collectors, lapidaries and jewellery makers alike.
Already revealing exceptional colour, the stone retains its rubbed finish and still has scope for final shaping and polishing. The freeform shape follows the natural contours of the opal, while the polished face reveals flashes of purple that glow beautifully across the stone.
With brightness 5, the colour play is bold and highly visible, showcasing the remarkable potential of this Australian opal before its final finish.
A miner‑direct piece with outstanding colour and natural character.
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Opal Type: Boulder Opal (Yowah)
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Format: Rubbed
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Colour: Blue, Purple
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Pattern: Pinfire
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Shape: Freeform
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Finish: Rubbed Finish
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Brightness: B5 (of 5)
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Stone Dimensions: Approx. 36 × 24 × 4 mm
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Weight: 6 g
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Fitting: None
- Source: Miner‑direct
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Origin: Yowah Opal Fields, Queensland, Australia
Note: Dimensions are approximate as this is a natural stone awaiting final shaping and polish
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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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Ethical Opal Sourcing
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A simple guide -
Opal Brightness Guide
Judging brightness