1.67ct AIGS certified Natural Alexandrite cat’s eye color change Srilanka gemstone Wbgem AXA33

Representing one of nature's rarest optical phenomena, this 1.67-carat Natural Alexandrite Cat's Eye combines both dramatic color change and sharp, centered chatoyancy. Sourced from the historic gem-bearing gravels of Sri Lanka (Ceylon), this exceptional specimen of phenomenal chrysoberyl transitions effortlessly from a delicate greenish-gray in natural daylight or fluorescent lighting to a rich purplish-red under warm incandescent illumination. Cut into a perfectly domed round cabochon with an excellent polish, the gem displays a razor-sharp, luminous cat's eye band that glides smoothly across the surface as the light moves. Completely untreated with zero thermal or artificial enhancements, this collector-grade gem is certified by the prestigious Asian Institute of Gemological Sciences (AIGS) confirming its natural identity and Ceylon provenance. A trophy gemstone destined for an extraordinary bespoke signet ring, pendant, or private connoisseur collection. Gemstone Specifications Species Natural Chrysoberyl Variety Natural Alexandrite Cat's Eye (Phenomenal) Carat Weight 1.67 ct Color & Color-Change Greenish-Gray (Daylight) to Purplish-Red (Incandescent Light) Phenomenon Chatoyancy (Sharp, well-defined cat's eye effect) Clarity Slight VVS (Ultra-fine parallel rutile silk responsible for clean chatoyancy; exceptional crystal transparency) Cutting & Shape Round High-Dome Cabochon (Excellent Polish) Enhancement / Treatment No Indications of Treatment (100% Natural & Untreated) Geographic Origin Sri Lanka (Ceylon) Laboratory Report AIGS (Asian Institute of Gemological Sciences) Certified The Dual Phenomenon: Chatoyancy Meets Color Change While traditional chrysoberyl cat's eyes and faceted alexandrites are each prized worldwide, the simultaneous occurrence of both phenomena in a single natural gem termed an Alexandrite Cat's Eye is exceedingly uncommon. To manifest this dual effect, the crystal requires trace amounts of chromium to trigger the pleochroic color shift alongside dense, microscopic parallel rutile needles precisely oriented perpendicular to the cabochon dome. Custom Fine Jewelry Commission This exceptional loose gem is ready for immediate addition to an investment portfolio or can be mounted into a custom jewelry masterpiece. Speak with our master jeweler to engineer a bespoke 18K yellow gold, rose gold, or platinum setting crafted to accentuate both its chatoyant ray and dramatic color transition.