Natural aquamarine, 4.30 carats, cushion cut, IF clarity, untreated, slightly bluish green, ČGL certified

Natural Aquamarine 4.30 ct – Cushion Cut, Untreated, ČGL Certified

Name: Natural Aquamarine 4.30 ct – Cushion Cut, Untreated, ČGL Certified
Brand: SOSNA Gems & Jewellery
SKU: 22-01-031
Price: 13146.00 CZK
Availability: InStock

13.146,00 CZK

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Gemstone Specification

Carat Weight 4.3

Dimensions 11.90 × 9.17 × 6.60 mm

Color Light Blue

Clarity Eye Clean

Shape Oval

Treatment No Treatment

Certification Sosna Gems Colored Stone Report

Description

This 4.30 carat natural aquamarine presents a refined slightly bluish-green hue, cut into a cushion shape measuring 11.90 × 9.17 × 6.60 mm. With internally flawless (IF) clarity, the gemstone exhibits exceptional transparency and brilliance, a rare and desirable feature in aquamarines of this size. Untreated and entirely natural, it preserves its authenticity and purity. Certified by the Czech Gemological Laboratory (ČGL), this gemstone comes with independent confirmation of its origin and quality. Its flawless clarity, elegant cushion cut, and certified authenticity make it an outstanding choice for bespoke fine jewelry or a prized addition to a curated gemstone collection.

Natural Aquamarine 4.30 ct – Cushion Cut, Untreated, ČGL Certified

13.146,00 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

Aquamarine is a blue to blue-green variety of beryl, appreciated for its clear, fresh coloration and natural transparency. Within the beryl family, it is valued for its calm visual character and refined appearance, particularly in well-cut stones with even color distribution.
Chemically composed of beryllium aluminum silicate (Be₃Al₂Si₆O₁₈), aquamarine crystallizes in the hexagonal crystal system and belongs to the silicate mineral group. In gem-quality specimens, it typically displays a vitreous luster and high transparency.
The refractive index of aquamarine generally ranges from 1.577 to 1.583, contributing to a subtle, elegant brilliance rather than strong dispersion. Aquamarine is found in several regions worldwide, with typical sources including Brazil, Madagascar, Mozambique, Nigeria, and Pakistan, each known for slightly different tonal qualities.

Durability & suitability

Aquamarine is a blue to blue-green variety of beryl, appreciated for its clear, fresh coloration and natural transparency. Within the beryl family, it is valued for its calm visual character and refined appearance, particularly in well-cut stones with even color distribution.
Chemically composed of beryllium aluminum silicate (Be₃Al₂Si₆O₁₈), aquamarine crystallizes in the hexagonal crystal system and belongs to the silicate mineral group. In gem-quality specimens, it typically displays a vitreous luster and high transparency.
The refractive index of aquamarine generally ranges from 1.577 to 1.583, contributing to a subtle, elegant brilliance rather than strong dispersion. Aquamarine is found in several regions worldwide, with typical sources including Brazil, Madagascar, Mozambique, Nigeria, and Pakistan, each known for slightly different tonal qualities.

Treatments & authenticity

With a hardness of 7.5 to 8 on the Mohs scale, aquamarine offers good durability suitable for everyday jewelry when properly set and worn with standard care. It performs reliably across a wide range of jewelry designs, including rings, pendants, earrings, and bracelets.
While aquamarine is generally resistant to everyday wear, larger stones or more exposed settings benefit from protective designs to reduce the risk of impact. Its combination of durability, clarity, and naturally soothing color makes aquamarine a versatile choice for both everyday jewelry and elegant, understated statement pieces.

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