Natural Greenish Yellow Topaz · 15.1 ct · Oval · Mixed Cut · unheated · Brazil

 3.308,71

Natural Topaz weighing 15.10 ct, displaying a delicate very light greenish-yellow colour with exceptional transparency and VVS clarity. Cut in an elegant oval brilliant cut and measuring 16.0 × 12.6 × 9.2 mm. This Brazilian gemstone is recorded as unheated and untreated and individually documented by Natural Gems Belgium.

1 in stock

NGB Reference: NGB-000902 SKU: FA-NGBTO24GT-001-301 Category: Brand:
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This individually documented natural greenish yellow Topaz is presented by Natural Gems Belgium with its specimen-specific identification, measurements and recorded characteristics. Weighing an impressive 15.10 carats, this transparent gemstone displays a delicate very light greenish-yellow colour, giving it a fresh and refined appearance.

The gemstone has been fashioned into an elegant oval shape with a brilliant cut, designed to maximise light return and enhance its overall brilliance. Measuring approximately 16.0 × 12.6 × 9.2 mm, the stone has substantial presence while maintaining pleasing proportions and a balanced visual profile.

Its VVS clarity allows light to travel through the gemstone with very limited visual interruption. Only minute internal characteristics are expected to be visible under magnification, contributing to a notably clean appearance for a natural gemstone of this size.

The combination of its transparent body, bright surface reflections and well-executed facet arrangement gives the stone a lively appearance under strong illumination. Its good cut and symmetry, together with good to very good polishing, support effective light return and a crisp overall presentation.

This Topaz is recorded as untreated, with no gemstone enhancement documented for this specimen. Its natural colour and optical appearance are therefore presented as recorded for the stone itself.

The gemstone is recorded as originating from Brazil, one of the world’s most important sources of natural Topaz and known for producing crystals in a wide range of colours and sizes.

Topaz is a distinct mineral species valued for its transparency, durability, characteristic vitreous lustre and ability to accept a high-quality polish. In larger transparent specimens, careful cutting can produce an especially attractive combination of brilliance, colour and visual depth.

As a natural gemstone, minute internal inclusions, subtle colour zoning, fine growth features or minor surface characteristics may occur. These features are part of the geological formation and individual identity of natural gemstone material.

Every gemstone presented by Natural Gems Belgium is individually documented according to its recorded identification, measurements and specimen-specific characteristics.

With its substantial 15.10 ct weight, exceptionally clean appearance, delicate greenish-yellow colour and bright oval brilliant cutting, this untreated natural Topaz offers an attractive combination of size, transparency and optical presence for collectors or distinctive jewellery designs.

Overall Score: 88/100

NGB Grade: Very Good

Quality Evaluation

Color15.0/20
Clarity19.0/20
Cut18.0/20
Optical Performance18.0/20
Overall Appeal18.0/20

Evaluation Notes

This natural Topaz presents a strong overall quality profile, with very good optical performance, a well-executed cut and a clean, highly transparent appearance. Its facet arrangement and proportions support effective light return and a lively presentation, while the high clarity further enhances brilliance. The principal limiting factor is the relatively light colour saturation, which slightly reduces overall visual intensity despite the gemstone’s otherwise very strong quality characteristics.

Species

Topaz

Gemstone Variety

Topaz

Gemstone Sub-variety

Yellow Topaz

Color

Yellow

Shape

Oval

Cut

Mixed Cut

Treatment

Unheated, Untreated

Origin

Brazil

Transparency

Transparent

Gemological Properties

Carat Weight15.1 ct
Dimensions16.0 × 12.6 × 9.2 mm
TransparencyTransparent
ClarityVVS
Refractive Index1.619 – 1.627
Specific Gravity3.49 to 3.57
Hardness8 Mohs
Birefringence0.008 to 0.010
Crystal SystemOrthorhombic
Dispersion0.014
LusterVitreous
Color Descriptionvery light greenish yellow
Transparency NotesTransparent
Natural CharacteristicsVVS : Minute natural inclusions and fine internal growth features may be visible only under magnification, consistent with its VVS clarity grade. Subtle natural colour variations may occur within the crystal. The stone is recorded as unheated and untreated, preserving its naturally occurring colour and internal character.

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