Oval marcasite cabochon, available in 6 sizes between 32×22 mm and 38×25 mm.
Item details
| Mineral |
Marcasite (iron disulfide, orthorhombic FeS₂ — polymorph of pyrite) |
| Dimensions |
6 sizes: 32×22 mm · 36×21 mm · 36×20 mm · 36×25 mm · 37×24 mm · 38×25 mm · thickness ~4–5 mm (±0.5 mm) |
| Shape and back |
Oval, flat back |
| Finish |
Mirror polish |
| Hardness |
6–6.5 Mohs — suitable for pendants and earrings; we recommend a closed bezel setting to protect the edge |
| Origin |
Material acquired from a lapidary wholesale market; likely East Asian origin |
| Treatment |
No treatment |
| Item type |
Available in 6 sizes (select from the dropdown menu) |
About this specific piece
Marcasite has an optical quality that is not reproduced in imitations: its metallic luster is not completely uniform.
The oval shape in these cabochons is optimized for direct setting: the regular shape simplifies the construction of the bezel in silver.
How marcasite's metallic luster forms
Marcasite (orthorhombic FeS₂) is the low-temperature polymorph of iron disulfide.
For what type of mounting it works
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Industrial or vintage design pendants in 925 silver — the silvery metallic sheen of marcasite creates a "silver on silver" effect in combination with the setting, ideal for designs with a vintage or contemporary aesthetic. The closed bezel protects the edge of the material.
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Large format statement earrings — 32–36 mm sizes are perfect for dangling earrings with a strong presence; the 4–5 mm thickness adds three-dimensionality without excessive weight.
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Wire wrap in silver or copper — the 6–6.5 Mohs hardness and flat back facilitate the work. The contrast between the wire and the metallic surface of the marcasite creates visually interesting designs.
Marcasite in jewelry tradition
In the history of Western jewelry, marcasite has played a unique role: during the 18th and 19th centuries, when diamonds were inaccessible to most of the population, European artisans used small facets of pyrite and marcasite to create affordable metallic-luster jewelry.
In crystal tradition, marcasite — like pyrite — is associated with protection and mental clarity. 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 marcasite
Genuine marcasite exhibits a true metallic luster that varies slightly with the angle: at 0° it is more silvery; at an oblique angle, warmer tones appear (golden-brass).
Frequently asked questions
What is the difference between marcasite and pyrite?
Both are iron disulfide (FeS₂), but they differ in crystal structure: pyrite is cubic and more stable; marcasite is orthorhombic and more reactive to humidity.
Is it suitable for frequent wear earrings?
Yes, with the precaution of avoiding prolonged contact with water and humidity. Marcasite can oxidize over time if regularly exposed to moisture.
Has it received any treatment?
No detectable treatment. Statement based on lapidary observation; the piece does not include formal gemological certification.
Why does the luster vary between pieces?
The optical anisotropy of marcasite produces differences in luster depending on the crystal's orientation relative to the polished plane. It is a natural variation inherent to the mineral, not a defect.
Are the dimensions exact?
The indicated dimensions have a tolerance of ±0.5 mm, typical of free-form cabochons. If you need exact measurements for a calibrated setting, please contact us before purchasing.
How is it cared for?
Clean only with a soft, dry cloth. Avoid water, acids, and ultrasonics. Store in a dry environment, separate from other pieces. Consult our jewelry and stone care guide.
More about sulfide minerals: properties and uses of pyrite. See also: cabochons for jewelry · handmade earrings.
