Prosopite Value, Price, and Jewelry Information

Prosopites as Pseudomorphs

Prosopites may form as pseudomorphs of topaz. This mineral may form first but then gradually changes chemical structure, becoming prosopite while retaining the external crystal form of the original topaz.

Do Prosopites Make Good Jewelry Stones?

Material from Zacatecas, Mexico has a turquoise-like blue color. These prosopites have an even coloration due to a copper content of approximately 1.4%. They make attractive and convincing turquoise simulants. Of course, they are distinct gem species.

If used as ring stones, place prosopites in protective settings to protect them from bumps and scratches or reserve them for occasional wear. Other uses, such as in pendants or brooches, shouldn't require any special protections.

How Can You Distinguish Prosopite from Turquoise?

Turquoise and Mexican prosopites can show similar colors and also have specific gravity values that overlap. A refractive index reading is the most effective way to distinguish them. (1.501-1.510 for prosopites; 1.590-1.650 for turquoises). Prosopites also have a lower hardness than turquoises, but scratch testing isn't recommended for finished gemstones.

Are There Any Enhanced or Synthetic Prosopites?

There are no known enhanced or synthetic prosopites.

Where is Prosopite Found?

Turquoise-like blue prosopite material occurs only in Santa Rosa, Zacatecas, Mexico, in association with azurite.

Other notable sources of crystals include the following:

• United States: Arizona; St. Peters Dome, El Paso County, Colorado (cryolite deposit); New Mexico; Dugway district, Tooele County, Utah (greenish color due to a trace of copper).
• Tasmania, Australia; Germany; Greenland.

Caring for Prosopite Jewelry

Avoid cleaning prosopites with mechanical systems, such as steam or ultrasonic processes. Instead, use a soft brush, mild detergent, and warm water. Consult our gemstone jewelry care guide for more recommendations.