Oval green aventurine cabochon with silver aventurescence produced by fuchsite (chromium mica) flakes. Three formats available: 28×21×4 mm (no. 2), 30×16×5 mm (no. 3) and 34×18×4 mm (no. 4). Flat mirror-polished back.
Piece Details
| Mineral |
Aventurine (quartzite with fuchsite) |
| Dimensions |
28×21×4 mm (no. 2) · 30×16×5 mm (no. 3) · 34×18×4 mm (no. 4). Variation ±0.5 mm |
| Shape and Back |
Oval, flat polished back |
| Finish |
Mirror polished |
| Hardness |
6.5-7 Mohs — suitable for rings with regular wear; we recommend a closed bezel setting |
| Origin |
Material acquired from a wholesale lapidary market |
| Treatment |
Untreated |
| Piece Type |
Available in 3 formats |
This particular piece
Aventurine is not a simple mineral but a quartzite — a metamorphic rock composed primarily of quartz with abundant inclusions of fuchsite (muscovite with chromium, Cr³⁺).
The three formats in this lot feature a medium green color with aventurescence visible to the naked eye under direct light. No. 3 (30×16 mm) has the most elongated silhouette of the group, suitable for vertically oriented pendants.
How aventurescence is formed
Green aventurine is a metamorphic rock formed from quartz-rich sandstones that were infiltrated by chromium-bearing hydrothermal fluids. Cr³⁺ replaced Al³⁺ in the muscovite structure, creating fuchsite (chromian muscovite).
What setting it works for
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Bezel setting (925 silver or other precious metals) — the medium green of aventurine contrasts particularly well with polished 925 silver; a custom-made bezel along the oval perimeter is the standard mounting for this hardness.
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Statement rings — the 6.5-7 Mohs hardness makes aventurine suitable for rings with regular wear; the 34×18 mm format (no. 4) is particularly striking for a cocktail or statement ring.
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Wire wrap — an alternative for those who work with wire; the oval outline allows for structured wrapping without risk of damaging the surface.
Aventurine in lapidary tradition
The name "aventurine" derives from the Italian "a ventura" (by chance), referring to the accidental discovery of aventurine glass by Murano manufacturers in the 17th century.
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 green aventurine
Genuine aventurine has aventurescence visible only from certain direct lighting angles — not from all angles.
Frequently Asked Questions
What is the difference between the three formats?
Each variant is an individual piece: no. 2 (28×21×4 mm), no. 3 (30×16×5 mm), no. 4 (34×18×4 mm). They differ in dimensions and in the length/width ratio, which affects the choice of setting. Product photographs show each variant separately.
What setting is it best suited for?
For a custom-made 925 silver bezel along the oval perimeter. The 6.5-7 Mohs hardness allows for regular ring wear. We recommend a closed bezel setting to protect the edge.
Has it been treated?
Untreated. The green color is a result of natural fuchsite (chromian muscovite) inclusions in the rock. This statement is based on lapidary observation; the piece does not include formal gemological certification.
Is aventurine the same as jade?
No. Aventurine is quartzite (quartz + fuchsite), with a hardness of 6.5-7 Mohs and a specific gravity of ~2.65 g/cm³. Jade can be nephrite (amphibole) or jadeite (pyroxene), both with different hardness and specific gravity.
What are the dimensions with tolerance?
No. 2: 28×21×4 mm · No. 3: 30×16×5 mm · No. 4: 34×18×4 mm. Variation of ±0.5 mm in any dimension.
How do I care for it?
Clean with a soft cloth and warm water. Aventurine is resistant to normal cleaning products, but prolonged ultrasonics should be avoided. See complete jewelry care guide.
More about aventurine: properties and uses of aventurine. See also: cabochon collection · artisan rings.
