Natural Smoky Quartz 292.45 ct – Round Cut, Heated, ČGL Certified

Natural Smoky Quartz 292.45 ct – Round Cut, Heated, ČGL Certified

Name: Natural Smoky Quartz 292.45 ct – Round Cut, Heated, ČGL Certified
Brand: SOSNA Gems & Jewellery
SKU: GR2451076
Price: 42971.00 CZK
Availability: InStock

42.971,00 CZK

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Gemstone Specification

Carat Weight 292.45

Dimensions 43.97 x 43.97 x 30.29 mm

Color Brown

Clarity Eye Clean

Shape Round

Treatment No Treatment

Origin Brazil

Certification Czech Gemological Laboratory

Description

This extraordinary 292.45 carat natural smoky quartz from Brazil is cut into a striking round brilliant shape, measuring 43.97 × 43.97 × 30.29 mm. Its orangy-brown body color, enriched through gentle heat treatment, creates a warm and elegant appearance. With VVS clarity, the gemstone displays excellent transparency, allowing light to dance across its precisely faceted surface. Certified by the Czech Gemological Laboratory (ČGL), this smoky quartz comes with independent confirmation of quality and authenticity. Due to its impressive size and flawless proportions, it is an exceptional collector’s gemstone and a remarkable centerpiece for decorative or bespoke design projects.

Natural Smoky Quartz 292.45 ct – Round Cut, Heated, ČGL Certified

42.971,00 CZK

Documentation & Verification

Every gemstone is supplied with the documentation stated in the product specification. This may include an independent laboratory certificate or a Sosna Gems Colored Stone Report.

Additional or alternative independent laboratory certification can be arranged upon request for eligible gemstones.

Learn about bespoke jewelry

Every bespoke piece begins with a gemstone. Selected gemstones from our collection can be transformed into individually designed jewelry, created around the proportions, character and intended use of each stone.

Every design is developed in consultation with our gemologists and goldsmiths, ensuring that the finished piece complements both the gemstone and your preferences.

Gemological overview

Technical and gemological information about this gemstone variety.

Gemological profile

Quartz is one of the most abundant and widely distributed minerals on Earth, valued in gem-quality form for its clarity, durability, and broad range of appearances. As a gemstone group, quartz encompasses many well-known varieties, as well as colorless and subtly toned material appreciated for its clean, understated character.
Chemically composed of silicon dioxide (SiO₂), quartz crystallizes in the trigonal crystal system and belongs to the silicate mineral group. In gem-quality specimens, it typically displays a vitreous luster with transparent to translucent clarity.
The refractive index of quartz generally ranges from 1.544 to 1.553, resulting in a soft, even brilliance rather than strong dispersion. Quartz is found worldwide, with notable sources including Brazil, Madagascar, Switzerland, the United States, and many other regions, reflecting its widespread geological occurrence.

Durability & suitability

With a hardness of 7 on the Mohs scale, quartz offers good durability suitable for everyday jewelry when properly set and worn with standard care. Its resistance to scratching and lack of cleavage contribute to reliable performance across a wide range of jewelry designs.
Quartz performs well in rings, pendants, earrings, and bracelets, particularly in settings that balance exposure with protection. Its durability, availability in larger sizes, and neutral visual character make quartz a versatile choice for both everyday jewelry and minimalist, design-focused pieces.

Treatments & authenticity

Quartz is commonly found in nature without the need for enhancement. Depending on the variety, treatments such as heat treatment or irradiation may be applied to modify color, practices that are widely accepted within the gem trade when properly disclosed.
Any treatments or enhancements are always clearly stated for each individual gemstone. Every stone is professionally examined, and transparent disclosure is regarded as a fundamental part of responsible gemological practice, allowing clients to make informed and confident decisions.

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