Natural amethyst, 25.30 carats, round concave cut, clarity: eye clean, violetish purple color, ČGL certified

Natural Amethyst 25.30 ct – Purple, Round Cut, Untreated, ČGL Certified

Name: Natural Amethyst 25.30 ct – Purple, Round Cut, Untreated, ČGL Certified
Brand: SOSNA Gems & Jewellery
SKU: AM0033GR
Price: 8591.00 CZK
Availability: InStock

8.591,00 CZK

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Gemstone Specification

Carat Weight 25.3

Dimensions 18.60 x 18.80 x 12.40 mm

Color Violetish Purple

Clarity Eye Clean

Shape Round

Treatment No Treatment

Certification ČGL - Czech Gemological Laboratory Certificate (EU)

This natural Amethyst weighs 25.30 carats and is expertly fashioned in a spectacular round concave cut, measuring 18.60–18.80 × 12.40 mm. The gemstone displays a rich violetish purple color with excellent transparency and clarity graded as eye clean, showing no inclusions visible to the naked eye. Its precision concave faceting creates extraordinary brilliance and depth, producing an impressive display of light reflection that gives the gemstone a vibrant and dynamic appearance.

Certified by the Czech Gemological Laboratory (ČGL), this gemstone has been independently verified as natural quartz of the amethyst variety. The combination of substantial carat weight, eye-clean clarity, vivid purple color, and highly desirable concave faceting makes this gemstone particularly appealing to collectors and custom jewelry designers. A remarkable natural amethyst suitable for statement pendants, collector pieces, and bespoke jewelry creations where exceptional brilliance and craftsmanship are desired.

Natural Amethyst 25.30 ct – Purple, Round Cut, Untreated, ČGL Certified

8.591,00 CZK

From gemstone to jewelry

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Gemological overview

Technical and gemological information about this gemstone variety.

Gemological profile

Amethyst is a violet to purple variety of quartz, recognized for its natural color range and consistent availability in gem-quality material. Within the quartz family, it is one of the most established and historically used gemstones, appreciated especially in larger sizes where color distribution and clarity can be fully evaluated.
Chemically composed of silicon dioxide (SiO₂), amethyst belongs to the silicate mineral group and crystallizes in the trigonal crystal system. In gem-quality specimens, it typically displays a vitreous luster and transparent clarity.
The refractive index of amethyst generally ranges from 1.544 to 1.553, resulting in a soft, balanced brilliance rather than sharp sparkle.
Amethyst is mined in several regions worldwide, with typical sources including Brazil, Uruguay, Zambia, and Madagascar, each known for slightly different color characteristics.

Durability & suitability

With a hardness of 7 on Mohs scale, amethyst offers solid durability suitable for everyday jewelry when properly set and worn with standard care. It performs reliably in a wide range of designs, particularly in pendants, earrings, and bracelets, where the stone is less exposed to direct impact.
While amethyst can be used in rings, it is best suited for settings that provide adequate protection, especially for larger stones. Its combination of durability, availability in generous sizes, and visually calming color makes it a versatile choice for both everyday pieces and more expressive, statement-oriented jewelry designs.

Treatments & authenticity

Amethyst is commonly found in nature without the need for enhancement. In some cases, gentle heat treatment may be applied within the gem trade to stabilize or refine color, a practice that is widely accepted when properly disclosed.
Any treatments or enhancements are always clearly stated for each individual gemstone. Every stone is professionally examined, and transparent disclosure is considered a fundamental part of responsible gemological practice, allowing clients to make informed and confident decisions.

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 .