CosmicOpals
Notes from the bench

Blog

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

A carved Native American headdress in boulder opal — intricate feather and bead detail in dark ironstone matrix with opal color peeking through.
The bench · 4 min

The headdress

Of every piece that's come off this bench, the headdress is probably the most hours per square inch.

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A large Virgin Valley crystal opal photographed through its water dome — full-spectrum green, orange, and red fire, with a dark streak of petrified wood still embedded in the center.
History · 4 min

The Nevada dome

The biggest piece we've pulled from Virgin Valley lives in water permanently. Here's what's inside it — and why it will never be cut.

A wire-wrap pendant holding two opals in a single silver wire frame — a dark blue opal on the left and a lighter crystal opal with pinfire on the right, set in coiled fine silver wire against a quartz crystal.
The bench · 3 min

Wire wrapping: setting without heat

Standard settings use heat somewhere in the process. Opal doesn't like heat. Wire wrapping is how you set a stone cold.

Polished Queensland boulder opal slabs — dark ironstone matrix with Koroit-pattern color running through in ochre, brown, and flashes of green.
Opals · 4 min

Boulder opal: why the ironstone stays

Most opal work is about separating the color from its host rock. In Queensland boulder opal, the ironstone is the point.

A 25.8-carat piece of rough Ethiopian Welo opal on black — rolling red, orange, and green flash across a crystal body with matrix at the base.
The bench · 3 min

A fresh parcel on the bench

Nine pieces of Ethiopian Welo, 17 to 59 carats each. What goes through your mind before the wheel touches any of it.

Large raw Ethiopian Welo opal resting in quartz matrix — brilliant orange and green fire burns through a water-clear crystal body.
Opals · 4 min

Welo, Ethiopia: where the fire lives

Most of the gem world learned Ethiopian opal existed around 2008. Here's where it actually comes from — and what makes it different from everything else.

The potch-and-matrix back of a rough Ethiopian Welo opal held in fingers — sandy host rock visible at the top, a sliver of color showing at the bottom edge.
The bench · 3 min

What the back tells you

Everyone photographs the face. Turn a rough opal over and you learn what you're actually working with.

Two faceted Ethiopian crystal opal teardrops on a white foam pad — the left showing broad floral color, the right electric pinfire.
Opals · 3 min

Faceted opal: the other way to cut

Most opal cutters cab. Here's why — and the one type of material where faceting actually makes sense.

A small carved Ethiopian crystal opal turtle resting on chunks of white quartz — green and red fire runs through the body of the carving.
The bench · 3 min

When the stone tells you the shape

With a cab, the cutter decides the shape. With a carving, the color bar gets a vote.

A large polished Ethiopian Welo opal cabochon photographed against purple flowers and green foliage — red, green, and blue pinfire fires across the oval dome.
The bench · 4 min

Opal care: the actual list

Twenty-plus years of answering the same question. Here's what you actually need to know — and the one thing that will definitely damage any opal.

Rough Ethiopian Welo opal held in both hands — brilliant pink-red and yellow-green play-of-color blazing across the surface.
The bench · 3 min

How to read rough

Before a cut happens, there's a longer process. Here's what twenty years of lapidary work looks like in the evaluation stage.

Raw Ethiopian Welo opal rough showing intense orange and red fire against a dark background — vivid warm play-of-color in an uncut stone.
Opals · 3 min

Orange fire in Welo

Most Ethiopian opal plays blue and green. The pieces that throw orange are rare enough that when you find one in a parcel, you set it aside.

Rough Ethiopian Welo opal held between fingers over pinkish sandy ground — vivid red, pink, green, and orange play-of-color blazing across the translucent stone.
Opals · 3 min

The opal that drinks water

Ethiopian Welo opal is hydrophane — it absorbs water, and the color goes flat when it dries out. Here's what that actually means.

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.

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.