This superb, doubly-terminated gem crystal is 23.66 carats, and has a classic, unheated, steely-blue color near the terminations and a sky blue color towards the center. It is GEMMY throughout. Specimens of this size tend to show rolling and rubbing from their source environment in the gem gravels, but this specimen is still sharp, with very good luster. From the noted gem crystal thumbnail collection of Dr. Jim Houran. Better yet in person as photos cannot convey the gemminess and subtlety of the colors as well as we would like.