Synthetic Rutile is an extremely rare synthetic that made its entrance onto the gem scene in 1948. Originally sold as a diamond simulant called Titania.  It is made through the flame fusion process and comes in a variety of colors.  Moh's hardness of 6, with incredible dispersion (approximately 0.330, compared to diamond's 0.044), and refractive indices of 2.616 to 2.903.  It is a fiery, brilliant gemstone worthy of any synthetic rough collection.

16.400 carats / 21 x 10.9 x 6.6 mm / clean

The rough has been ground clean thus the chalky, dull surface - shown slightly damp

• Cut gemstones photo provided as reference