Natural Spinel Rough · 4.637 ct · For Faceting · Unheated · Deep purplish red

€ 12,05

Natural Spinel rough for faceting weighing 4.637 ct and measuring approximately 9.8 × 7.5 × 6.0 mm. This translucent specimen displays a deep purplish-red colour with lighter red zones, natural inclusions and a visible surface-reaching cavity. Suitable for careful faceting, with final yield dependent on orientation and removal of included or irregular areas. Unheated and untreated.

1 in stock

NGB Reference: NGB-000838 SKU: RO-SPIN024RE-001-096 Category: Brand:
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This natural Spinel rough weighs 4.637 ct and measures approximately 9.8 × 7.5 × 6.0 mm. The specimen displays a deep purplish-red body colour with warmer reddish areas visible where the material transmits more light.

The rough is translucent and retains a strongly natural, irregular crystal surface. Rounded growth forms, shallow depressions, surface-reaching irregularities and uneven contours are visible across the specimen. Several areas show stronger colour concentration, while thinner or more open sections reveal brighter red to reddish-purple tones under transmitted light.

Natural internal features are clearly present, including darker included areas and localized structural irregularities. A distinct dark inclusion or cavity is visible near one surface, together with additional smaller natural features. These characteristics will need to be considered carefully during orientation and preforming.

The 4.637 ct starting weight provides useful material for faceting, but this is not clean transparent rough. Its value lies in the strong purplish-red colour and the possibility of recovering a smaller faceted stone with attractive colour if the cutter can work around the more heavily included and irregular areas.

The rough shape offers several possible cutting orientations, although the natural surface depressions and internal inclusions will reduce usable yield. Careful planning will be required to balance colour retention, depth and removal of weaker or less suitable areas.

Spinel has a hardness of 8 on the Mohs scale and no cleavage, making successfully cut material durable for jewellery use.

This specimen is unheated and untreated, preserving its natural deep purplish-red colour, inclusions and original rough structure. With its strong colour, compact proportions and substantial starting weight, it offers interesting potential for an experienced cutter prepared to prioritise colour and character over maximum yield.

Overall Score: 84/100

NGB Grade: Very Good

Quality Evaluation

Natural Characteristics18.0/20
Inclusion Profile16.0/20
Faceting Potential17.0/20
Usable Yield / Shape Potential16.0/20
Overall Rough Quality17.0/20

Evaluation Notes

This natural Spinel rough shows very good faceting potential, primarily supported by its strong deep purplish-red colour and useful 4.637 ct starting weight.

The material is translucent rather than clean transparent, with visible internal inclusions, darker concentrations and a distinct surface-reaching cavity. These features, together with the irregular rough shape, will reduce usable yield and require careful orientation during preforming.

The strongest potential lies in preserving the richer red to purplish-red areas while cutting around the darker included zones and surface irregularities. Overall, the specimen offers interesting colour-driven faceting potential for an experienced cutter, with final quality depending strongly on orientation and recovery.

Species

Spinel

Gemstone Variety

Spinel

Color

Red

Treatment

Unheated, Untreated

Transparency

Translucent

Gemological Properties

Carat Weight4.637 ct
Dimensions9.8 × 7.5 × 6.0 mm
TransparencyNot Applicable
ClarityN/A
Refractive Index1.715-1.747
Specific Gravity3.55 to 3.90
Hardness7.5-8 on Mohs' scale Mohs
Crystal SystemCubic
Dispersion0.013
LusterN/A
Color DescriptionDeep purplish red
Transparency NotesTransparent after facetting. The recorded transparency is considered together with the specimen’s individual internal characteristics.
Natural CharacteristicsThe Spinel rough displays a deep purplish-red colour with lighter red zones where the material transmits more light. The specimen is translucent and shows natural colour variation, internal inclusions and localized darker concentrations. The rough surface retains irregular growth contours, shallow depressions and surface-reaching features. A distinct dark included area or cavity is visible near one surface, together with smaller internal structural irregularities. For faceting, careful orientation will be required to preserve the strongest colour while working around inclusions, cavities and uneven surface areas. Final yield will depend on how much clean and structurally suitable material can be retained during preforming.

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