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Cut stone

1.43ct Russian Demantoid with Horsetails

1.43 ct · Demantoid · Garnet

Ural demantoid with the horsetail inclusion that no other locality gives you.

$11,600

$8,111.89 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

Demantoid has higher dispersion than diamond, and a well-cut round like this throws visible fire in almost any light. The horsetail — a radiating spray of chrysotile fibres from a chromite crystal — is diagnostic of Ural Mountain material and is regarded as a feature rather than a fault, which is one of the few places in the trade where an inclusion adds value.

Slightly included by grading convention, entirely because of that horsetail.

Specification

Specification for 1.43ct Russian Demantoid with Horsetails
FormCut stone
SpeciesGarnet — Demantoid
Weight1.43 ct
ShapeRound
Measurements6.4 × 6.3 × 4.2 mm
ColourVivid grass green, slightly yellowish, very high dispersion
Colour familyGreen
ClaritySlightly included
CutRound brilliant
PhenomenaStrong dispersion
OriginUral Mountains, Russiaour assessment

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The stone’s 6.4 × 6.3mm 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. Horsetail inclusions are diagnostic of Ural material.

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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