Although quite dark (nearly black), this is a very nice specimen of alexandrite. Some of the crystals are transparent enough that the appear purple when illuminated from behind with incandescent light. They also show very good color change, appearing green in sunlight. The entire mass is a cluster of tightly intergrown crystals, a few of which have excellent form. Of course, if it was transparent enough to be gem quality, it would have been cut into dozens of gemstones, and never would have graced our site.