0.97 Ct. Cabochon Alexandrite from Russia

This listing from The Natural Gemstone Company presents a translucent 0.97 carat oval alexandrite, dimensions 6.35 x 4.81 x 3.38 mm, fashioned as a classic cabochon to maximize color change. The bodycolor exhibits a yellowish green to purplish brown shift, with medium color intensity under typical viewing conditions, and a clarity grade of included as evaluated at eye level. The cutting choice is deliberate, with a moderate dome height derived from the 3.38 mm thickness to balance light transmission and color saturation, and the surface displays an excellent polish that yields clean reflections and minimal surface graining. No treatments or enhancements have been applied, and the material provenance is Russia, a source known for chromium bearing chrysoberyl of fine color change characteristics. For reference, chrysoberyl alexandrite typically shows refractive index in the range 1.746 to 1.755, birefringence around 0.008 to 0.010, and specific gravity close to 3.73, properties that inform cutting and mounting decisions and that contribute to the gem hardness and wearability.

From a lapidary and gemological perspective the cabochon profile is optimized to showcase the dichroic and color change phenomena produced by chromium substitution in the chrysoberyl lattice, the domed surface enhancing the perceptual shift between incandescent and daylight spectra. Internal features consistent with the included grade are present, including small mineral crystals and localized feathering, which can act as light scattering centers that soften the color transitions and add character to the gem. The excellent polish indicates careful final lap work and fine abrasives were used to remove cutter marks while preserving the integrity of the dome. For setting considerations a low bezel may secure the stone and protect the girdle area while allowing the dome to present the color change optimally, whereas a minimal prong setting could expose more light but requires precise seat preparation given the cabochon profile. Owing to chrysoberyl hardness near Mohs 8.5 the stone is suitable for everyday jewelry, though care is advised to avoid strong thermal shocks and aggressive cleaning methods that may exploit internal inclusions, therefore steam and ultrasonic cleaning are not recommended for stones with notable feathering. This Russian alexandrite is a collectible specimen for connoisseurs seeking natural, unenhanced material, and The Natural Gemstone Company is pleased to offer it with full disclosure of its gemological attributes.