Natural ametrine, brownish yellow / purple, cushion cut, 15.87 ct, loose gemstone.

Certificate of Natural ametrine, brownish yellow / purple, cushion cut, 15.87 ct, loose gemstone

Natural Ametrine 15.87 ct – Cushion Mixed Cut, IGI Certified

Name: Natural Ametrine 15.87 ct – Cushion Mixed Cut, IGI Certified
Brand: SOSNA Gems
SKU: AME-000001
Price: 17478.00 CZK
Availability: InStock

17.478,00 CZK

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This 15.87 ct natural ametrine displays a distinct bicolor distribution of brownish yellow and purple. The gemstone is transparent, allowing for clear observation of the internal color zoning characteristic of this quartz variety. A cushion mixed cut defines the proportions, measuring 16.08 x 13.69 x 9.47 mm.

The cut quality and dimensions highlight the interplay between the two hues, which meets the standard for collectors of bicolored species. The generous carat weight and saturated tones categorize this stone as a significant example of natural ametrine.

Verification is provided by the IGI laboratory under report number 586359234. This independent documentation confirms the weight, cushion mixed cut, and natural color characteristics of the gemstone. Such certification ensures transparency for the owner and provides a reliable record for future valuation.

The scale and clarity of this 15.87 ct ametrine make it a suitable center stone for custom jewelry commissions. It serves as an excellent addition to a professional gemstone portfolio or a specialized collection focused on unique color phenomena.

Natural Ametrine 15.87 ct – Cushion Mixed Cut, IGI Certified

17.478,00 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 .