Five carats of cushion-cut lab-created blue alexandrite in solid 10K yellow gold is one of the most compelling pieces in the entire collection: alexandrite's color-change property - blue-green in daylight shifting to purple-red under incandescent light - makes this ring literally different every time the light source changes. Lab-created alexandrite delivers this same phenomenon with identical chemistry to natural alexandrite at a fraction of the price of the genuine stone, which is rarer and more valuable than ruby or emerald at equivalent quality. At 5 carats in a cushion cut, the color change is dramatic and visible across the full stone surface. White diamond accents in solid gold complete the fine jewelry setting. This is the ring that generates conversation everywhere it goes.