CosmicOpals
Notes from the bench

Blog

Opals, cutting, and how this shop came to be. Written at the same bench the stones come off.

Rough Ethiopian Welo opal held in the cutter's fingers — vivid blue and purple play-of-color.
History · 4 min

Twenty years to a name

CosmicOpals didn't start as a shop. It started as a rock habit in Santa Cruz that got out of hand.

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A wet crystal opal slab fresh from the wash bucket at Rainbow Ridge, blue, green, and orange play-of-color on dark wet rock.
History · 6 min

The claim in Virgin Valley

We don't just buy rough — once a year we go dig our own, on a ten-acre fire opal claim in the Nevada high desert.

Five polished Ethiopian Welo opal cabochons on black velvet — vivid pinfire play-of-color across each dome.
Opals · 4 min

What play-of-color actually is

The rainbow in an opal isn't pigment and it isn't a trick of polish. It's geometry, a few hundred nanometers at a time.

Polished freeform opal cabochon on weathered wood — pale crystal body with electric blue play-of-color.
The bench · 3 min

Why we list the cracks

Every listing we write names the sand, the cracks, the matrix. Here's why we'd rather lose a sale than skip that paragraph.