Richness of the purple spinel is complimented and contrasted by color changing alexandrites. The combination of the two is visually intriguing and the addition of black rhodium gives the pendant an edgy touch, despite being set in rose gold. Alexandrite is one of the rarest gemstones on earth, and stone in the halo exhibit nearly 100% color change Brazilian Alexandrite. Wonderful everyday pendant, that transitions from day to night with color changing properties, alexandrites change color from blue-green in daylight to purple-red in incandescent.