W018 / Washington

Ellensburg blue agate

Locality-linked blue chalcedony/agate

Use soft blue color as a starting point, then check the old label and chain of ownership. Blue is not a certificate of origin.

← Western Lapidary Materials
Verified reference photograph pending

What it is

Locality-linked blue chalcedony/agate

What to look for

Use soft blue color as a starting point, then check the old label and chain of ownership. Blue is not a certificate of origin.

At the cutting bench

Inspect the actual piece for fractures, voids and cutting orientation. Deposit-specific yield and polish data are UNKNOWN.

Under the loupe

Other blue chalcedony is an important comparison. A Commons jewelry image carries an Ellensburg filename but insufficient specimen provenance, so it is withheld.

Source & collecting access

Current parcel access and production are unknown. Historical collector interest is not enough to calculate present rarity or value.

Status checked 2026-10-01

The market notebook

UNKNOWN — no verified completed-sales sample sufficient for a range

Market researched 2026-10-01

Open the field notes

Color comparison tags

Blue, White/Cream/Clear

Geology & evidence limits

USGS’s historical industry account identifies prized blue agate from Kittitas County. Detailed formation and deposit boundaries still need primary research.

Collecting & trade history

Current parcel access and production are unknown. Historical collector interest is not enough to calculate present rarity or value.

Reading old-stock material

Preserve the estate label, wrapping, purchase record and associated pieces. Old-stock status alone does not authenticate origin or imply a premium.

What we know—and what we don’t

Visual resemblance is a comparison clue, not proof of material identity, locality or documented provenance. Keep source labels and estate records separate from your visual assessment.

C&C Reference Collection

Reference photograph pending. Do not substitute an unlicensed dealer image or a similar-looking specimen of uncertain identity.

Sources & Further Reading
  1. USGS historical chalcedony industry account

    1995; indexed passages reviewed, full retrieval unavailable

Cut and polish with appropriate wet methods and silica-dust controls. Historic directions and mine names are not current permission to collect.