This ruby crystal is from Arusha in the Arusha Region of Tanzania. This is a huge diversified area that contains over 100 different mineral species including ruby. Ruby is the red variety of corundum which is an oxide that contains the elements Al and O. This is a double terminated complex crystal with a pseudo-octohedral habit. It has a rose red color and a silken luster. It measures 16 x 15 x 12 mm.