Natural alexandrite chrysoberyl, 1.56 carats, oval faceted cut, unheated, color change from greenish yellow to purple, Sri Lanka Ceylon origin, AIG certified gemstone

Natural Alexandrite Chrysoberyl 1.56 ct – Oval Cut, Unheated, AIG Certified

Name: Natural Alexandrite Chrysoberyl 1.56 ct – Oval Cut, Unheated, AIG Certified
Brand: SOSNA Gems & Jewellery
SKU: ALX-0001-AIG
Price: 53948.00 CZK
Availability: InStock

53.948,00 CZK

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Gemstone Specification

Carat Weight 1.56

Dimensions 7.94 x 5.87 x 4.29 mm

Color Greenish Yellow to Purple

Clarity Eye Clean

Shape Oval

Treatment No Treatment

Origin Sri Lanka (Ceylon)

Certification AIG

Description

This natural alexandrite chrysoberyl weighs 1.56 carats and displays a remarkable color-change effect, shifting from greenish yellow in daylight to purple under incandescent light. The gemstone is expertly fashioned in an elegant oval faceted cut measuring 7.91 × 5.87 × 4.26 mm, enhancing both its brilliance and the visibility of its rare optical transformation. Alexandrite is one of the world’s most sought-after collector gemstones due to its exceptional rarity and dramatic color-changing properties.

Originating from Sri Lanka (Ceylon), a historically prestigious source of fine gemstones, this alexandrite remains completely untreated, with no indication of heat treatment, preserving its authentic natural beauty and rarity. Chrysoberyl alexandrite is highly prized among collectors because natural color-change stones of this quality are exceptionally uncommon. The gemstone is accompanied by an independent AIG laboratory certificate confirming its natural origin, authenticity, and color-change characteristics.

Its rare optical phenomenon, elegant oval cut, and certified untreated status make this alexandrite an exceptional gemstone for collectors and bespoke high-end jewelry creations.

Natural Alexandrite Chrysoberyl 1.56 ct – Oval Cut, Unheated, AIG Certified

53.948,00 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

Alexandrite is a rare color-changing variety of chrysoberyl, valued for its distinct ability to shift color under different lighting conditions. In natural daylight, alexandrite typically appears green to bluish-green, while under incandescent light it displays red to purplish-red hues, a phenomenon known as color change.
Chemically composed of beryllium aluminum oxide (BeAl₂O₄), alexandrite crystallizes in the orthorhombic crystal system and belongs to the oxide mineral group. In gem-quality specimens, it typically displays a vitreous luster with transparent clarity.
The refractive index of alexandrite generally ranges from approximately 1.741 to 1.760, contributing to a balanced brilliance that supports, rather than overwhelms, its color-changing behavior. Natural alexandrite is found in a limited number of locations worldwide, including Russia, Brazil, Sri Lanka, and parts of East Africa.

Durability & suitability

With a hardness of approximately 8.5 on the Mohs scale, alexandrite offers very good durability suitable for everyday jewelry when properly set and worn with standard care. Its lack of cleavage contributes to strong resistance against impact and abrasion compared to many other color-changing gemstones.
Alexandrite performs well in rings, pendants, earrings, and bracelets, including designs intended for regular wear. Its combination of durability and visual complexity makes it suitable for both everyday jewelry and refined, statement-oriented designs where lighting conditions can enhance its unique character.

Treatments & authenticity

Natural alexandrite is most commonly found without the need for enhancement. Treatments are generally uncommon, as the gemstone’s color-changing properties are inherent to its natural crystal structure.
Any treatments or enhancements, if present, 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 .