Blue Green Kyanite · Oval Faceted

Oval cabochon of greenish-blue kyanite, faceted cut (external cut with multiple planes). Pleochroic gem: shows different shades depending on the viewing angle, from moss green to sky blue. Material from a wholesale gem market.

Item details

This specific piece

Greenish-blue kyanite is less common than the classic blue variety — the turquoise-green color is produced by a specific combination of iron and vanadium in the crystal lattice. The external facets multiply the flashes of light without needing the complete transparency of a fully clear gem, creating an effect of chromatic depth that changes with movement.

Variants Nr.3 and Nr.4 are individual pieces without industrial calibration: each has its own free-form oval silhouette, chosen to take advantage of the area of greatest color saturation in the original crystal.

Pleochroism: kyanite's color change

Kyanite is a triclinic mineral with marked pleochroism: observed along its main crystallographic axis, it appears intense blue-green, while viewed perpendicularly it can show a lighter green or almost colorless. This phenomenon —caused by differential absorption of polarized light along different axes— is diagnostic of the mineral species and cannot be reproduced by colored glass. In the faceted cut, the cut takes advantage of the axis of greatest saturation to show the most intense color towards the front face.

What setting it works for

• Closed bezel pendant (925 silver) — the faceting provides sparkle without the need for directed lighting; kyanite's soft edge requires full bezel protection.
• Wire wrap — by wrapping the entire edge with square-section silver wire, the necessary protection is achieved with an artisanal aesthetic consistent with the irregular character of the piece.

Kyanite in lapidary tradition

Green kyanite is less common in historical collections than blue, although 19th-century mineralogical records document it as a notable variety of the same species. In crystal tradition, kyanite in green tones is associated with the connection between thought and action — the stone of those who work with their hands from the mind.

The symbolic properties attributed to minerals belong to cultural and historical traditions. They are shared for educational purposes, not as medical advice or a substitute for professional care.

How to recognize genuine kyanite

Vitreous to pearly luster with fibrous texture visible under magnification on the edge. Pleochroism —change of hue depending on the viewing axis— is a diagnostic characteristic. Anisotropic hardness (4.5 parallel to the axis / 6–7 perpendicular) can be checked with a mineral of known hardness. Glass imitations do not show pleochroism or hardness anisotropy.

Frequently asked questions

How is it different from blue kyanite?

Same mineral species (Al₂SiO₅), different proportion of chromophoric elements: the greenish-blue variety has a greater presence of vanadium and iron in an oxidized state, which shifts the hue towards green. The hardness and pleochroism properties are identical.

Does the color change depending on the light?

Yes, like any pleochroic stone: the hue varies from moss green to sky blue depending on the viewing angle. This is a natural optical phenomenon of the species, not a treatment effect.

Is it suitable for a ring?

For occasional use with a closed bezel that protects the edge. Not recommended for daily wear rings given the low hardness along the longitudinal axis.

What are the dimensions of each variant?

Approximately 11–15 mm on the major axis, with ±0.5 mm tolerance. Variants Nr.3 and Nr.4 may differ from each other; each is a unique free-form piece, not industrially calibrated.

Is it color treated?

Untreated. The greenish-blue color is natural, without dye or irradiation. Statement based on lapidary observation; no formal gemological certification.

How to care for it?

Soft damp cloth; no ultrasound or steam. Store separately. More at jewelry care.

See also: cabochon collection.