Natural Amethyst 12.45 ct – Cushion Cut, Untreated

Natural amethyst, 12.45 carats, cushion cut, untreated, lavender-purple color

Natural Amethyst 12.45 ct – Cushion Cut, Untreated

Name: Natural Amethyst 12.45 ct – Cushion Cut, Untreated
Brand: SOSNA Gems & Jewellery
SKU: 2975615
Price: 2947.00 CZK
Availability: InStock

2.947,00 CZK

Gemstone Specification

Carat Weight 12.45

Dimensions 18.40 × 12.40 × 8.80 mm

Color Lavender Purple

Clarity Eye Clean

Shape Oval

Treatment No Treatment

Certification Basic Seller's Certificate

This 12.45 carat natural amethyst displays a gentle lavender-purple hue, offering a soft and elegant appearance typical of high-quality amethyst. Cut in a cushion faceted shape measuring 18.4 × 12.4 × 8.8 mm, it shows lively brilliance thanks to its well-executed facet pattern and rounded outline.
Completely untreated, the stone maintains its natural color and clarity without enhancement.
With its substantial size and refined sparkle, this amethyst is an excellent choice for statement jewelry such as cocktail rings, pendants, or artistic custom designs.
A versatile gemstone appreciated for its calming color and balanced proportions.

Natural Amethyst 12.45 ct – Cushion Cut, Untreated

2.947,00 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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Bespoke jewelry

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Each design is developed individually, guided by the stone, its proportions and natural character.

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Gemological Disclosure

Each gemstone is professionally examined and accompanied by clear gemological information regarding its characteristics, treatments, and origin.

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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 .