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Stones of CeylonRough & Cut
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Rough

11.8ct Spinel Crystal, Mahenge

11.80 ct · Spinel · (rough)

A sharp Mahenge octahedron — a specimen first, a cutting stone second.

$5,900

$500.00 per carat · AUD, GST included where applicable

Demonstration record

This example is here to show the disclosure format. It is not real inventory, does not enter product feeds and cannot be reserved or purchased.

  • One of a kind — when it sells it is gone, and the listing stays up as a record.
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About this stone

A well-formed spinel octahedron from Mahenge with clean faces and undamaged edges. At 11.8ct it would cut, but the crystal form is good enough that it is worth more as a specimen than as whatever came out of it — which is the calculation a buyer should make for themselves.

Untreated, as natural spinel invariably is. No yield estimate is offered.

Specification

Specification for 11.8ct Spinel Crystal, Mahenge
FormRough
SpeciesSpinel
Weight11.80 ct (2.36 g)
ShapeNatural crystal
Measurements14.2 × 11.8 × 9.4 mm
ColourPink-red, strongly saturated. Sharp octahedron.
Colour familyPink
ClaritySlightly included
OriginMahenge, Tanzaniaour assessment

Calibrate the size

ANY BANK CARD
The stone’s 14.2 × 11.8mm outline, drawn to the same scale as a bank card. Hold one against the screen and the stone beside it is life size — if the card does not match, zoom until it does. The outline is the idealised shape rather than this stone’s own profile; the photographs are the stone.

Treatment & certification

No treatment

No heat and no other treatment of any kind.

How we know

Untreated natural crystal.

Certification arranged by written quote

Before any laboratory service is purchased, we agree the laboratory, its current fee, insured carriage, expected timing and what happens if the result changes the existing description. Nothing is dispatched until the agreed work is complete.

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Laboratory descriptions are quoted as that laboratory’s finding; they do not replace the complete disclosure record.

Every listing on this site states its treatment, including when the honest answer is that we don’t know. How we describe stones.

Evidence provenance

This is an educational record. Its values demonstrate the format and do not represent an owned stone or publication-approved evidence file. It cannot be purchased or exported as a product.

Shipping, inspection and care

No carrier promise is inferred from this page. At checkout the live service must find a recently verified route that accepts loose gemstones, the destination and the full declared value.

You have seven days from delivery to request a change-of-mind return, in addition to rights under Australian Consumer Law. Read the inspection and return process.

Keep the stone loose, dry and separated from harder material. Do not use heat, chemicals, ultrasonic cleaning or steam without advice specific to the species, treatment and condition. Rough and specimens should not be altered during the inspection period.

Permanent disclosure history

Demonstration data has no commercial disclosure version.

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