4.23 ct slightly greenish blue aquamarine in rectangular cut

Natural Aquamarine 4.23 ct – Slightly Greenish Blue, Rectangular Cut, Untreated

Name: Natural Aquamarine 4.23 ct – Slightly Greenish Blue, Rectangular Cut, Untreated
Brand: SOSNA Gems & Jewellery
SKU: GP-114148
Price: 12882.00 CZK
Availability: InStock

12.882,00 CZK

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Gemstone Specification

Carat Weight 4.23

Dimensions 12.74 x 8.26 x 5.92 mm

Color Light Blue

Clarity Eye Clean

Shape Octagonal

Treatment No Treatment

Certification Czech Gemological Laboratory Certificate

This natural Aquamarine weighs 4.23 carats and is expertly fashioned in a classic emerald cut (cut-cornered rectangular shape), measuring 12.74 × 8.26 × 5.92 mm. The gemstone displays a delicate very light, slightly greenish blue color, characteristic of fine natural aquamarine. With exceptional IF (Internally Flawless) clarity, the stone exhibits extraordinary purity and transparency, making it particularly attractive to collectors and fine jewelry enthusiasts.

Its elegant step-cut faceting emphasizes the gemstone's remarkable clarity and creates a sophisticated hall-of-mirrors effect, a hallmark of high-quality emerald-cut gemstones. The clean lines and refined proportions enhance the natural beauty of the aquamarine while showcasing its exceptional transparency.

Certified by the Czech Gemological Laboratory (ČGL), this gemstone has been independently verified as natural beryl of the aquamarine variety. The combination of IF clarity, natural origin, elegant emerald cut, and laboratory certification makes this gemstone an excellent choice for bespoke jewelry creations and discerning collectors. A refined aquamarine perfectly suited for rings, pendants, and custom-designed jewelry where purity and elegance are paramount.

Natural Aquamarine 4.23 ct – Slightly Greenish Blue, Rectangular Cut, Untreated

12.882,00 CZK

From gemstone to jewelry

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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.

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 .