A 3.00 carat square octagonal lab-created alexandrite with 0.18 carats of round white diamond in a solid 10K yellow gold vintage-inspired pendant on an 18-inch Singapore chain measuring approximately 0.80 inches with a 2.5mm bail and lobster claw clasp - the alexandrite pendant that delivers the most remarkable optical phenomenon in gemology: color change. Alexandrite is the chromium-bearing chrysoberyl that appears distinctly green in daylight and distinctly red-to-purple under incandescent light - a dual-color existence that no other gemstone replicates. At 3.00 carats lab-created, this pendant delivers the full alexandrite color-change experience in a solid 10K gold vintage-inspired setting with diamond accents.