Tanzanite Skyscrapers

What are some rare photos of raw, rough and uncut gemstones?

Close up on well defined crystal on graphite matrix. Scientifically called "blue zoisite" , the gemstone was renamed as Tanzanite by Tiffany & Co. who wanted to capitalize on the rarity and single location of the gem. Fine tanzanites are more affordable than sapphires, and usually better in terms of both color and clarity. However, tanzanites are softer compared to sapphires. Also, tanzanite is trichroic and with sapphire-blue, sage green and purple colors respective to the three vibrational directions, orientation is an important consideration for cutters who need to consider both the yield and the resulting color.