Translucent apple-green prehnite oval cabochon, 29–30 × 19–24 mm. Mirror polish on convex face, flat back. The translucence of prehnite creates an internal depth effect that responds well to settings in 925 silver or copper.
Piece Details
| Mineral |
Prehnite (calcium aluminum inosilicate) |
| Dimensions |
29–30 × 19–24 mm (±0.5 mm; see variant) |
| Shape and Back |
Freeform oval, flat back |
| Finish |
Mirror polish |
| Hardness |
6–6.5 Mohs — we recommend a closed bezel setting |
| Origin |
Material acquired at a wholesale lapidary market |
| Treatment |
Untreated |
| Piece Type |
Available in 8 numbered variants |
This specific piece
The color is a pale apple-green with a soft internal veil when turned under light — a consequence of the mineral's laminar structure. The oval format ~30 × 20 mm is a classic range for custom bezel statement rings: sufficient presence, edges that allow for a clean bezel without tension points. Each variant has its exact measurement in the name.
How the translucent color forms
Prehnite crystallizes in the orthorhombic system through hydrothermal alteration of mafic rocks. The green comes from traces of chromium or ferruginous iron. The translucency is due to growth in parallel layers: light penetrates and disperses between layers before exiting, creating the depth effect. Inclusions of epidote or rutile are part of the natural structure, not defects.
What setting it works for
-
Closed bezel setting (925 silver or gold) — oval profile without corners; the bezel enhances translucence without obstructing it.
-
Statement rings / Silver pendants — ~30 mm provides presence without being excessive; the pale green combines with oxidized or polished silver.
-
Wire wrap — flat back facilitates anchoring of the weave.
Prehnite in lapidary tradition
Prehnite was the first mineral named in honor of a person: Colonel Hendrik von Prehn, who brought samples from South Africa in the late 18th century. Abraham Werner recognized it as an independent species in 1788. In crystal tradition, it is associated with calm and discernment — with the ability to let go of what no longer serves and maintain clarity under pressure.
The symbolic properties attributed to minerals belong to cultural and historical traditions. They are shared for educational purposes, not as medical advice.
How to recognize genuine prehnite
Under transmitted light, a greenish-yellow glow appears, never opaque like nephrite jade. The texture under magnification shows the fibrous-laminar pattern; dyed green glass, a common substitute, appears homogeneous. An inclusion of epidote or rutile confirms authenticity.
Frequently Asked Questions
Is it natural prehnite without treatments?
Yes. No detectable treatment. Statement based on lapidary observation; does not include formal gemological certification.
What setting is it designed for?
We recommend a closed bezel in 925 silver, copper, or brass. The oval profile is compatible with a bezel cut to the stone or with standard strip. The jeweler decides the technique.
What is the difference between variants?
Each variant is a numbered piece with its exact dimensions. All share the apple-green color range and mirror finish, but each stone has its own internal translucency pattern.
Are the measurements exact?
Tolerance ±0.5 mm, as these are individual freeform pieces, not industrially calibrated production.
Can it be used in everyday rings?
With a closed bezel, yes. At 6–6.5 Mohs, it can scratch if it rubs against harder minerals; the bezel protects the edge.
How to care for it?
Lukewarm water and mild soap, dry with a soft cloth. Avoid ultrasonics and acids. More at jewelry care.
View collection: cabochons for jewelry. See also lapidary selection.
