Here's a more detailed description:
* Color: Rough tanzanite is usually a dull grayish-brown, sometimes with hints of purple or blue. It's quite opaque, meaning light can't pass through it easily.
* Shape: It's found in irregular, often chunky, shapes, formed by natural processes. You might find it in clusters, individual crystals, or even embedded in the rock.
* Surface: The surface of rough tanzanite can be rough and uneven, with a dull, matte finish. It may have inclusions (small imperfections) or cracks.
The transformation from dull rough to sparkling gem is a testament to the skill of gem cutters and the magic of light. After cutting and polishing, tanzanite reveals its incredible blue and violet hues and its brilliant brilliance.