Dumortierite cabochons in milky white quartz, approximately 9 × 8 × 4 mm. Royal to ultramarine blue dumortierite veins on a base of pure white quartz: a clean chromatic contrast in a minimalist format.
Item details
| Mineral |
Dumortierite in white quartz (aluminum silicate in quartz matrix) |
| Dimensions |
9 × 8 × 4 mm (oval or rectangular; see variant) |
| Shape and back |
Oval or rectangular depending on variant; flat back |
| Finish |
Mirror polish |
| Hardness |
7 Mohs — we recommend bezel setting |
| Origin |
Material acquired in lapidary wholesale market |
| Treatment |
Untreated |
| Item type |
Unique piece per variant |
This specific piece
The veining pattern of dumortierite varies in each piece: in some specimens the veins are linear and dense, in others they form clouds or swirls. The blue is authentic — not reflective or iridescent — with a saturation ranging from royal blue to dark navy depending on the local concentration of dumortierite crystals within the quartz matrix.
How dumortierite in quartz is formed
Dumortierite is an aluminum nesosilicate that crystallizes under high-grade metamorphic conditions, mainly in aluminous rocks (such as aluminous schists or granulites). When magma or hydrothermal fluids introduce quartz subsequent to an area where dumortierite already exists, the quartz can cement and engulf the acicular dumortierite crystals, creating a composite rock where the blue of the dumortierite is entangled in the white network of the quartz.
What mounting works for
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Bezel setting (925 silver) — The 9 × 8 mm format fits perfectly into standard size bezels for small earrings or signet rings in silver. 925 silver neutralizes without competing with the blue of the dumortierite.
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Stud earrings or minimalist rings — The dimensions make these pieces ideal candidates for everyday jewelry in a discreet format.
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Fine wire wrap — With 24-26 gauge wire, these small cabochons allow for a delicate wrap that leaves the stone's pattern visible.
Dumortierite in lapidary tradition
Dumortierite was formally described in 1881 by the French mineralogist Alphonse Lacroix, who named it in honor of Eugène Dumortier, a Lyonnaise paleontologist. It is not a stone with ancient history in jewelry; its use as a lapidary mineral became popular in the 20th century when deposits in Madagascar, Brazil, and Nevada began to produce material of sufficient quality and size for carving.
In crystal tradition, dumortierite is associated with mental clarity and the ability to communicate precisely. Its dense and stable blue — without the variations of turquoise or chalcedony — is interpreted as a reference to the constancy of orderly thought.
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 dumortierite in quartz
Genuine dumortierite in quartz has blue veins or spots with a fibrous or acicular structure: under magnification, the blue is not a superficial layer but has depth and internal tonal variation. The surrounding quartz is opaque milky white, not transparent.
Frequently Asked Questions
What variants are available?
Available in oval (nr.1) and rectangular (nr.2), both 9 × 8 × 4 mm. Select the shape in the variant selector. Each piece is individual with its own veining pattern.
Is it suitable for everyday earrings?
Yes. With a hardness of 7 Mohs and a compact format, it is suitable for stud earrings or pendants for everyday wear with a bezel setting.
Does it have color treatment?
No detectable treatment. The blue of dumortierite is natural and stable; it does not fade with use or exposure to light.
See more small cabochons: lapidary collection. See also: all cabochons.
