Material: Available in 18k  - Alexandrite and Moissanite stones. A unique crystal structure and combination of elements allow this gemstone to display an optical, color-changing effect. From daylight to candlelight, this remarkable color-changing gem shifts in hue when shimmering in different lighting. The most fascinating fact about this gemstone is that it exhibits a drastic color change when viewed under daylight or fluorescent light versus incandescent light. The rarest and most sought after Alexandrite's change color from an emerald green to a raspberry redWHAT IS MOISSANITE? Moissanite is a diamond simulant made of silicon carbide. A diamond simulant is a stone that has a similar appearance to a diamond but is not a real diamond. It is very difficult to tell apart a diamond & moissanite, making moissanite a common diamond alternative.