Natural ametrine, bi color, fancy cut, 10.67 ct, loose gemstone.

Natural Ametrine 10.67 ct – Fancy Cut, Untreated

Name: Natural Ametrine 10.67 ct – Fancy Cut, Untreated
Brand: SOSNA Gems
SKU: AMR-000011
Price: 3313.00 CZK
Availability: InStock

3.313,00 CZK

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This 10.67 ct natural ametrine displays a distinct bicolor transition between violet and yellow tones. The gemstone is fashioned into a fancy cut with dimensions of 17.48 x 14.35 mm, maximizing the visual separation of the two color zones. Ametrine of this clarity and scale is a technical rarity for the species.

The clarity is graded as eye clean, indicating a lack of inclusions visible to the unaided eye. This high transparency ensures uninterrupted brilliance across the broad facets of the fancy shape. The stone shows no indication of treatment, preserving its natural color characteristics and chemical composition.

Documented with a Sosna Gems internal report, this 10.67 ct ametrine serves as a significant specimen for a variety-focused collection. Independent laboratory certification is available on request. Its dimensions and saturated bicolor zoning make it a candidate for a statement pendant or a custom architectural jewelry design.

Natural Ametrine 10.67 ct – Fancy Cut, Untreated

3.313,00 CZK

From gemstone to jewelry

This example illustrates one possible way a gemstone may be developed into a bespoke piece. Final design is always defined individually, based on the stone and its natural character.

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Gemological overview

Technical and gemological information about this gemstone variety.

Gemological profile

Ametrine is a naturally occurring bicolor variety of quartz, combining purple amethyst and golden citrine within a single crystal. It is valued for its distinctive color zoning, which creates a clear visual contrast between violet and yellow tones, making each stone inherently unique.
Chemically composed of silicon dioxide (SiO₂), ametrine belongs to the silicate mineral group and crystallizes in the trigonal crystal system, like other quartz varieties. In gem-quality specimens, it typically displays a vitreous luster and transparent clarity.
The refractive index of ametrine generally ranges from 1.544 to 1.553, resulting in a soft, balanced brilliance rather than strong dispersion. Natural ametrine is found almost exclusively in Bolivia, where geological conditions allow the coexistence of both color zones within a single crystal.

Durability & suitability

Ametrine is a naturally occurring bicolor variety of quartz, combining purple amethyst and golden citrine within a single crystal. It is valued for its distinctive color zoning, which creates a clear visual contrast between violet and yellow tones, making each stone inherently unique.
Chemically composed of silicon dioxide (SiO₂), ametrine belongs to the silicate mineral group and crystallizes in the trigonal crystal system, like other quartz varieties. In gem-quality specimens, it typically displays a vitreous luster and transparent clarity.
The refractive index of ametrine generally ranges from 1.544 to 1.553, resulting in a soft, balanced brilliance rather than strong dispersion. Natural ametrine is found almost exclusively in Bolivia, where geological conditions allow the coexistence of both color zones within a single crystal.

Treatments & authenticity

With a hardness of 7 on the Mohs scale, ametrine offers good durability suitable for everyday jewelry when properly set and worn with standard care. It performs reliably in a variety of designs, particularly in pendants, earrings, and rings with protective settings.
Due to its characteristic color zoning, ametrine is often cut to emphasize the contrast between amethyst and citrine areas, making orientation and setting especially important. Its combination of durability, visual interest, and size availability makes it well suited for expressive, statement-oriented jewelry designs as well as distinctive everyday pieces.

Our approach to gemstones

We focus primarily on natural, untreated gemstones, valued for their authenticity and inherent beauty.
Any treatments or enhancements are always clearly disclosed, allowing our clients to make informed decisions based on transparent gemological standards.

Sosna Gems is not a licensed financial advisor. Gemstones are collectibles, not securities. Past performance is not indicative of future results. Legal & risk disclosure .