Natural Chrysoberyl · 0.94 ct · Oval · Cat’s-Eye · Cabochon

$1 714.64

Natural Cat’s-Eye Chrysoberyl weighing 0.94 ct, fashioned in an oval cabochon cut and measuring approximately 6.4 × 4.5 × 3.2 mm. This translucent gemstone displays a yellowish-green body colour with a distinct brownish-yellow central zone and chatoyancy, producing a visible moving cat’s-eye light band. Natural inclusions and internal structural features contribute to its individual optical character. Unheated and untreated.

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NGB Reference: NGB-000861 SKU: FA-CHR024CH-001-001 Category: Brand:
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This individually natural Cat’s-Eye Chrysoberyl weighs 0.94 ct and is fashioned in an oval cabochon cut, measuring approximately 6.4 × 4.5 × 3.2 mm. The gemstone displays a predominantly yellowish-green body colour with a distinct brownish-yellow concentration through the central area, creating a naturally varied and highly individual appearance.

A defining characteristic of this specimen is its chatoyancy, producing a visible cat’s-eye light band across the gemstone. As the stone or light source is moved, this concentrated band of reflected light shifts across the surface, creating the characteristic optical phenomenon associated with Cat’s-Eye Chrysoberyl.

Chrysoberyl is a beryllium aluminium oxide mineral, BeAl₂O₄, and is one of the classic gem materials capable of displaying chatoyancy when suitable aligned internal structures are present. The cat’s-eye effect results from the interaction of light with directionally oriented internal features, producing a concentrated luminous band rather than ordinary facet reflection.

The gemstone is translucent and displays an included clarity profile classified as I. Natural internal inclusions and structural features are clearly present and form part of the optical character of the stone. In chatoyant Chrysoberyl, such oriented internal structures can contribute directly to the formation of the cat’s-eye phenomenon and therefore represent an important part of the gemstone’s identity rather than simply a clarity limitation.

The natural colour distribution is also distinctive. The outer areas show a yellowish-green appearance, while the central portion develops a warmer brownish-yellow tone. This variation creates additional depth and visual contrast beneath the moving chatoyant band.

The oval cabochon form gives the specimen a compact and balanced presentation while allowing the natural colour zoning, inclusions and cat’s-eye effect to remain clearly visible. Its vitreous luster contributes additional surface brightness and enhances the interaction between the body colour and the moving light band.

This specimen is documented as unheated and untreated, preserving its natural yellowish-green to brownish-yellow colour distribution, included internal structure and confirmed chatoyancy.

With its distinctive natural cat’s-eye effect, unusual colour zoning, translucent body and compact oval cabochon presentation, this 0.94 ct Chrysoberyl offers a highly individual combination of optical phenomenon and natural gemstone character.

Overall Score: 78/100

NGB Grade: Good

Quality Evaluation

Color14.0/20
Clarity14.0/20
Cut16.0/20
Optical Performance17.0/20
Overall Appeal17.0/20

Evaluation Notes

This natural Cat’s-Eye Chrysoberyl presents a good overall quality profile, distinguished by its chatoyancy, yellowish-green body colour and contrasting brownish-yellow central zoning.
The gemstone’s principal strength is the visible cat’s-eye effect, which creates a concentrated mobile light band across the stone and provides strong optical interest. The translucent body and directionally oriented internal structures support this phenomenon, while the natural colour zoning adds further individuality.
The I clarity profile reflects clearly visible inclusions, veils and internal structural features. These characteristics reduce internal cleanliness, but in this specimen they are also closely associated with the development of the chatoyancy and therefore contribute to its optical identity.
The oval cabochon form provides a balanced presentation, while the vitreous luster enhances surface brightness and helps emphasize the moving light band. The overall appearance is attractive and distinctive, though limited by the included clarity and moderate transparency.
The combination of confirmed chatoyancy, natural colour zoning, vitreous luster, individual optical character and overall visual appeal supports a good 78/100 assessment.

Species

Chrysoberyl

Gemstone Variety

Chrysoberyl

Color

Multicolor

Shape

Oval

Cut

Cabochon

Treatment

Unheated, Untreated

Transparency

Translucent

Optical Phenomenon

Cat's Eye

Gemological Properties

Carat Weight0.94 ct
Dimensions6.4 × 4.5 × 3.2 mm
TransparencyTranslucent
ClarityI
Refractive Index1.740-1.777
Specific Gravity3.68-3.80
Hardness8.5 Mohs
Birefringence0.008-0.012
Crystal SystemOrthorhombic
Dispersion0.015
LusterVitreous
Color DescriptionMainly yellowish green with in center brownish yellow
Transparency NotesTranslucent; assessed together with the specimen-specific clarity and internal characteristics.
Natural CharacteristicsThe Chrysoberyl displays a translucent yellowish-green body colour with a distinct brownish-yellow concentration through the central portion of the gemstone. This natural tonal variation creates visible colour zoning and adds depth to the overall appearance. A chatoyant light band is present across the stone, producing the characteristic cat’s-eye effect. The band shifts with changes in viewing angle or illumination and is associated with directionally oriented internal structures within the Chrysoberyl. Natural inclusions and internal structural features are clearly visible, consistent with the recorded I clarity profile. These include aligned internal features, fine veils and localized included areas that contribute both to the included appearance and to the development of the chatoyancy. Subtle differences in translucency and internal brightness occur across the gemstone, particularly around the central brownish-yellow zone and the areas intersected by the cat’s-eye band. The combination of yellowish-green colour, central brownish-yellow zoning, translucent structure, visible natural inclusions and confirmed chatoyancy gives this Chrysoberyl a highly distinctive and individual natural character.

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