Pair of Owyhee blue opal cabochons in freeform shapes (16-31 mm). Uniform silky-grey blue, no play-of-color. Acquired at a lapidary wholesale market; each pair is hand-selected for tone and dimension similarity.
Item details
| Mineral |
Owyhee blue opal (hydrated common opal) |
| Dimensions |
16-31 mm depending on variant (see selector) |
| Shape and back |
Freeform, flat back |
| Finish |
Mirror polish |
| Hardness |
5.5-6 Mohs — we recommend a closed bezel setting |
| Origin |
Oregon, USA (Owyhee River basin) |
| Treatment |
Untreated |
| Item type |
Hand-selected pair |
About this specific piece
Owyhee opal is a common sedimentary opal type: it does not show play-of-color, but its blue is dense and homogeneous, with no streaks or dead zones. The pair is matched for similarity in tone, thickness, and silhouette to work well as twin earrings or as bilateral pieces in any design.
What mounting it works for
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Closed bezel in 925 silver — The 5.5-6 Mohs hardness requires a low bezel that properly covers the perimeter edge.
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Twin earrings — The pair format makes them natural candidates for symmetrical earrings.
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Wire wrap — Polished surface with no sharp edges; the wire anchors well without risk of marks.
Owyhee blue opal in lapidary tradition
Since the 19th century, the Owyhee River basin (Oregon-Idaho) has produced sedimentary opal in blue-grey tones, formed by amorphous silica deposited in volcanic fissures. Lapidaries value it for its consistent pastel blue, very different from the sparkle of noble Ethiopian or Australian opal. In crystal tradition, blue opal is associated with the calmness of clear thought and honest communication.
The symbolic properties attributed to minerals belong to cultural traditions. They are shared for educational purposes, not as medical advice.
How to recognize genuine Owyhee blue opal
Authentic Owyhee does not show sparkle under direct light — it is silky matte blue and uniform. A glass or resin imitation usually weighs less and has a perfectly homogeneous surface. Real opal has a slightly irregular microstructure visible with a 10× loupe.
Frequently asked questions
What is the difference between Owyhee opal and Ethiopian opal?
Owyhee is common opal (without play-of-color): uniform blue-grey, opaque or semi-translucent. Ethiopian opal is noble opal with multicolored sparkle. They are mineralogically similar but aesthetically very distinct.
Can it be used in rings?
With a closed bezel setting, it is possible, but its hardness (5.5-6 Mohs) makes it more delicate than quartz. For daily wear, prefer earrings or pendants.
Is it treated or dyed?
No detectable treatment. The blue-grey color is the natural pigmentation of the mineral. Statement based on lapidary observation; no formal gemological certification.
Are the two pieces in the pair identical?
No: they are natural pieces selected for similarity, not industrially calibrated. There may be differences of ±2 mm or slight variations in tone. The freeform shape is inherent to the material.
How is it cared for?
Avoid ultrasonic cleaners, abrasives, and sudden temperature changes. Clean with a soft, damp cloth. More in our care guide.
See also: cabochon collection · opal properties.
