Natural Spinel · 0.99 ct · Oval · Greyish Blue to Violetish Blue · Unheated

$170.75

Natural Spinel weighing 0.99 ct, fashioned in an oval mixed cut and measuring approximately 7.8 × 5.4 × 2.9 mm. This transparent gemstone displays a very light grayish-blue to pale violetish-blue colour with deeper blue edge reflections and SI clarity. A noticeable central window reduces light return through the centre, while the outer facets retain attractive colour contrast. Unheated and untreated.

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NGB Reference: NGB-000835 SKU: FA-SPIN024PB-001-106 Category: Brand:
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This natural Spinel weighs 0.99 ct and is fashioned in an oval mixed cut, measuring approximately 7.8 × 5.4 × 2.9 mm. The gemstone displays a very light grayish-blue to pale violetish-blue body colour, with deeper blue reflections developing around the outer facets and under lower-light viewing conditions.

The material is transparent and presents an SI clarity profile. Small natural inclusions and fine internal features are visible under magnification, but they remain relatively discreet and do not significantly disturb the overall transparency of the gemstone.

The oval outline is reasonably balanced and the mixed faceting produces attractive darker blue reflections around the perimeter. The polish appears good, with generally clean facet surfaces and acceptable symmetry.

Because the stone is relatively shallow at 2.9 mm compared with its 7.8 × 5.4 mm face-up dimensions, a noticeable central window is present. This reduces light return through the centre and is the principal limitation of the cut. The outer facets nevertheless retain stronger colour and create attractive contrast between the pale centre and deeper blue edge reflections.

The colour itself is delicate rather than strongly saturated, ranging from pale grayish blue to subtly violetish blue depending on lighting and viewing angle. Its transparent character and cool-toned appearance give the stone a refined, understated presentation.

This Spinel is unheated and untreated, preserving its natural colour and internal characteristics.

Overall, the gemstone combines good transparency, attractive cool blue colour and a pleasing oval outline, while the shallow proportions and central window remain the main factors limiting optical performance and overall cut quality.

Overall Score: 82/100

NGB Grade: Very Good

Quality Evaluation

Color16.0/20
Clarity17.0/20
Cut16.0/20
Optical Performance16.0/20
Overall Appeal17.0/20

Evaluation Notes

This natural Spinel presents a very good overall quality profile, combining attractive very light grayish-blue to pale violetish-blue colour with good transparency and an SI clarity grade.
The SI clarity is supported by small natural inclusions and fine internal features that remain relatively discreet and do not significantly disturb the face-up appearance. The gemstone retains good transparency and a clean overall visual character.
The main limitation is the noticeable central window caused by the shallow proportions. This reduces light return through the centre of the stone, although the outer facets still produce stronger blue reflections and attractive contrast around the perimeter.

The combination of appealing cool-toned colour, good transparency, SI clarity and pleasant overall appearance, balanced against the reduced central optical performance from windowing, supports a very good 82/100 assessment.

Species

Spinel

Gemstone Variety

Spinel

Color

Blue

Shape

Oval

Cut

Mixed Cut

Treatment

Unheated, Untreated

Transparency

Transparent

Gemological Properties

Carat Weight0.99 ct
Dimensions7.8 × 5.4 × 2.9 mm
TransparencyTransparent
ClaritySI
Refractive Index1.715-1.747
Specific Gravity3.55 to 3.90
Hardness7.5-8 Mohs
Crystal SystemCubic
Dispersion0.020
LusterVitreous
Color Descriptionvery light grayish-blue to pale violetish-blue
Transparency NotesTransparent; assessed together with the specimen-specific clarity and internal characteristics.
Natural CharacteristicsThe Spinel displays a transparent very light grayish-blue to pale violetish-blue body colour, with deeper blue reflections concentrated around the outer facets. Natural variation in tone is visible across the stone, giving the colour a soft and slightly zoned appearance. The recorded SI clarity is consistent with the visible internal character. Small natural inclusions, fine internal features and minor localized clarity variations are present under magnification, but they remain relatively discreet and do not significantly reduce overall transparency. The combination of pale cool-toned colour, stronger blue edge reflections and moderate natural inclusions gives this Spinel a distinctive but relatively clean natural appearance.

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