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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

Stones above $5,000 are sold by arrangement rather than through the basket. Above that value no ordinary courier will both carry and insure a loose stone, so carriage goes through a specialist service and is quoted for your destination — and settlement is by bank transfer, which keeps the card fee off a sum this size.

Enquire about this stone

The person who answers is the person who owns the stone.

  • Sent by a specialist insured service, quoted for your destination.
  • Seven days from delivery to inspect and return for a full refund.
  • 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

How big it actually is

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

Unheated

No heat and no other treatment of any kind. Bought at source, so the heat status is known rather than assumed.

How we know

Untreated natural crystal.

Certification arranged with the sale

A stone at this level does not go through the basket, so the report is arranged as part of the sale rather than added at checkout. We’ll send it to GIA, SSEF, Gübelin, GRS or Lotus, quote the fee with the stone, and nothing is dispatched until the report is back. Allow three to six weeks.

We use the international laboratories rather than local ones, which is the point of paying for it.

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

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Find rough like this? We buy it.