Amphibole Quartz Triangle Cabochon · 19×18 mm

Triangular freeform amphibole quartz cabochon, 19×18 mm, hand-cut in our lapidary workshop from rough material imported from Brazil. The piece has three distinct color zones: intense red-brown on the periphery, dark hornblende in the intermediate, and amber-gold spots in the heart that illuminate when light hits at a low angle — as if the inside of the stone changes state when rotated.

Piece Details

This specific piece

At 19×18 mm with an almost square silhouette, this is a statement stone. What makes it unique is the internal gradient: the red-brown of the edges gives way to a dark concentration of hornblende, and in the center, amber-gold spots emerge with three-dimensional depth — it's not a superficial layer but something happening within the quartz. Under side light, the amber flashes with coppery metallic reflections that a photo cannot fully capture.

The rounded triangular silhouette works equally well pointed or with the flat base, giving the jeweler two compositional options within the same setting. The high-gloss mirror polish intensifies the internal reflections even under diffuse indoor light.

What mounting it works for

• Bezel setting (925 silver or other precious metals) — at 19 mm it calls for a medium gauge bezel; in slightly oxidized 925 silver, the contrast with the red-brown and amber is particularly effective.
• Statement ring — the quasi-square shape and generous size make this piece the natural center of a dome ring; it works oriented pointed or with the flat base depending on the setting's design.
• Wire wrap — the organic silhouette is comfortable for perimeter wrapping techniques in silver or copper wire; the warm copper complements the central amber of the stone.

Amphibole quartz in lapidary tradition

Quartz with mineral inclusions has a long history in lapidary work. In classical Rome, included quartz cabochons — with rutile, tourmaline, and amphibole — were carved for amulets and seals of authority. Varieties with hornblende from Brazil arrived on the European market in the 18th century, when mining in Minas Gerais became industrialized. In crystal tradition, amphibole quartz is associated with grounding and the clarity that emerges from integrating shadow and light in the same space — a balance that this stone visually represents with its gradient from dark to amber.

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 amphibole quartz

Genuine amphibole quartz shows irregularly distributed inclusions under magnification — dark acicular or columnar crystals suspended in the vitreous mass, with alternating zones of concentration and clear quartz. The color transition is three-dimensional: it changes with the angle of side light. Dyed glass imitating amphibole quartz has a flat, homogeneous color without depth gradient, and weighs notably less than authentic mineral.

Frequently Asked Questions

What is the origin of this quartz?

Cut in our workshop from rough material imported from Brazil. No detectable treatment; the color gradient is a result of native amphibole minerals and iron oxides within the quartz mass.

Can it be used in an everyday ring?

Yes. With 7 Mohs, quartz withstands daily wear. We recommend bezel setting to protect the freeform edges and prevent direct impacts on the stone's perimeter.

How is it cared for?

Lukewarm water and neutral soap, dried with a lint-free cloth. Avoid ultrasonics if there are visible fissures. More at jewelry care.

See also: lapidary workshop · collection cabochons · handmade rings.