Natural Rainbow Moonstone · 7.535 ct · Marquise Cabochon · Rainbow Adularescence

$39.40

Natural Rainbow Moonstone · 7.535 ct · Marquise Cabochon

A distinctive natural Rainbow Moonstone displaying pronounced rainbow adularescence across an elegant marquise cabochon. Individually evaluated by Natural Gems Belgium.

NGB Reference: NGB-000005
Treatment: No indications of heating or other treatment
Exact gemstone shown · Only 1 available

1 in stock

NGB Reference: NGB-000005 SKU: CA-MOON024RB-002-164 Category: Brand:
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Natural Rainbow Moonstone – 7.535 ct Marquise Cabochon

A distinctive natural Rainbow Moonstone fashioned as an elegant marquise cabochon, displaying pronounced rainbow adularescence across its polished surface.

As the stone moves in changing light, flashes of blue and multicoloured optical character become visible against the translucent body. This shifting play of colour gives the gemstone its individual appearance and is one of the defining characteristics of fine Rainbow Moonstone material.

The elongated marquise cabochon has been shaped and polished to present the optical phenomenon effectively. Unlike a faceted gemstone, the smooth domed surface allows the adularescence to move visibly across the stone as the viewing angle changes.

Its substantial size, distinctive shape and visible rainbow effect make this an appealing individual gemstone for collectors or bespoke jewellery designs where the natural optical character of the material can take centre stage.

This is the exact natural gemstone shown in the accompanying photographs and documentation.

Overall Score: 91.0/100

NGB Grade: Excellent

Quality Evaluation

Color18.0/20
Overall Appeal18.0/20
Phenomenon15.0/20
Natural Characteristics16.0/20
Shape, Symmetry & Polish18.0/20

Evaluation Notes

An attractive natural Rainbow Moonstone displaying pronounced rainbow adularescence across its elongated marquise cabochon form. The optical phenomenon is clearly visible and contributes strongly to the gemstone's visual character. Its milky white to near-colorless body provides an effective background for the shifting blue and multicoloured flashes. Natural fissures and inclusions are present but remain consistent with the character of the material and do not prevent the phenomenon from presenting effectively. The polished marquise form, optical performance and substantial size result in an excellent overall presentation.

Species

Feldspar

Gemstone Variety

Moonstone

Color

Multicolor

Shape

Marquise

Cut

Cabochon

Treatment

Unheated, Untreated

Transparency

Transparent

Optical Phenomenon

Adularescence

Gemological Properties

Carat Weight7.535 ct
Dimensions20.7 × 6.9 × 6.7 mm
TransparencyTransparent
ClarityIncluded
Refractive Index1.520–1.525
Specific Gravity2.56–2.59
Hardness6 Mohs
Birefringence0.005–0.006
Crystal SystemMonoclinic
LusterVitreous to Pearly
Color DescriptionMilky white with rainbow adularescence
Transparency NotesTransparent to translucent, allowing the rainbow adularescence to remain clearly visible as the viewing angle changes.
Natural CharacteristicsNatural fissures and inclusions present.

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