Natural Moonstone · 4.039 ct · Oval Cabochon · Light Blue Adularescence

$17.53

Natural Moonstone weighing 4.039 ct, cut as an oval cabochon and measuring 11.2 × 8.8 × 4.9 mm. The stone displays a milky to translucent body with soft light-blue adularescence, natural internal veils and a visible fissure, together with slight surface inequalities that preserve its individual character. No indications of heating or other treatments were observed.

1 in stock

NGB Reference: NGB-000058 SKU: CA-MOON024LB-002-140 Category: Brand:
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This natural Moonstone is a 4.039 carat oval cabochon displaying a soft light blue adularescence over a milky white to translucent body. The optical effect appears as a delicate blue sheen that becomes more visible under directional light and shifts subtly as the gemstone is moved.

Measuring approximately 11.2 × 8.8 × 4.9 mm, the stone has a balanced oval form and a smooth cabochon profile that allows the internal feldspar structure and adularescence to remain clearly visible. Its relatively compact size makes it suitable for a ring, pendant or bespoke jewellery design where a subtle rather than highly dramatic Moonstone effect is preferred.

The gemstone shows natural internal characteristics, including a visible internal fissure and minor structural features associated with its geological formation. Slight inequalities are also present on the flatter surface area, giving the cabochon a less perfectly uniform finish while preserving the natural character of the stone.

The body ranges from milky translucent to clearer areas, with internal veils and structural variation contributing to the shifting light response. The blue adularescence is lighter and more delicate than in strongly saturated blue Moonstones, giving the stone a softer and more understated appearance.

No indications of heating or any other treatment have been observed. The gemstone is therefore presented as a natural, untreated Moonstone, with its optical effect and internal characteristics preserved in their natural state.

Overall Score: 83.0/100

NGB Grade: Good

Quality Evaluation

Color17.0/20
Overall Appeal17.0/20
Phenomenon17.0/20
Natural Characteristics18.0/20
Shape, Symmetry & Polish14.0/20

Evaluation Notes

A good natural Moonstone with a soft light-blue adularescence and a pleasing oval cabochon form. The gemstone shows attractive milky-to-translucent body character and a delicate optical response under directional light. Natural internal fissures, fine veils and subtle feldspar layering are visible, while slight inequalities on the flatter surface reduce overall refinement. Despite these characteristics, the stone retains a balanced appearance and appealing natural Moonstone character.

Species

Feldspar

Gemstone Variety

Moonstone

Color

Multicolor

Shape

Pear

Cut

Cabochon

Treatment

Unheated, Untreated

Transparency

Transparent

Optical Phenomenon

Adularescence

Gemological Properties

Carat Weight4.039 ct
Dimensions11.2 × 8.8 × 4.9 mm
TransparencyTransparent
ClarityI
Refractive Index1.520–1.525
Specific Gravity2.56–2.59
Hardness6 Mohs Mohs
Birefringence0.005–0.006
Crystal SystemMonoclinic
LusterVitreous to Pearly
Color Descriptionmilky white with light blue adularescence
Transparency NotesTransparent to translucent appearance depending on internal structure and viewing direction.
Natural CharacteristicsNatural internal fissure, fine internal veils, subtle feldspar layering, minor variations in transparency, and slight inequalities on the flatter surface. These natural structural features contribute to the stone’s soft light-blue adularescence and individual character.

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