Unheated Color Change Sapphire mined from the Spokane Bar near Helena, Montana. It is 0.82ct, 5.6mm x 3.56mm in a brilliant round cut. Appears purple in incandescent and fluorescent lighting and blue in sunlight and LEDs. Completely eye clean and arguably loupe-clean, there's tons of fire and sparkle here for that beautiul new jewelry project. I'm tempted to keep it!!