Color Change Sapphire – Natural, Faceted, Blue, 0.69 ct

An outstancing alexandrite-like color change sapphire that goes from a pleasing blue-green in daylight to purple under incandescent light . It's also completely untreated, eye clean and should fit in most settings made for 6x4mm emerald cuts. Color: Blue-Green to Purple, Treatment: None, Cut: Emerald, Weight: 0.69, Dimensions: 5.95 x 4.32. (Information supplied by photo contributor.) © Daniel Stair, CustomGemstones.com

Credit: Daniel Stair, CustomGemstones.com 2014