Chocolate Opal

Chocolate opal is prized for the warm, cozy contrast between a brown body and flashes of green, orange, and gold. Here's what you're actually looking at.

What is chocolate opal?

It's simply opal with a rich brown body color and play-of-color on top. The name describes the look, not a separate mineral. The warm base tends to flatter fiery greens and oranges, which is a big part of its appeal.

Natural vs treated

Two very different stones share the name:

• Naturally brown: some Ethiopian opal has a genuine brown body, historically associated with the older Mezezo (Shewa) source.
• Treated: bright Welo opal smoke-treated to a chocolate-brown tone — the same family of treatment used for black opal.

Both can be lovely; the difference matters for price and disclosure. Ask which you're being offered, and get the answer in writing.

How to tell them apart

Treated chocolate opal often shows color concentrated near the surface, with lighter material visible on the girdle or any chips, and a price that undercuts natural brown opal. The tests in the authenticity guide apply here too.

Value and care

Natural brown-body stones command more than treated ones; treated chocolate opal is affordable and should be priced accordingly (see price & value). Whether natural or treated, Ethiopian chocolate opal is typically hydrophane, so it needs the water-aware handling in the care guide.