This is truly an excellent 10.74 carat Tanzanite loose gemstone with IGL paperwork. The stone exhibits a fine large of 10.74 carat size with very good trillion cut having measurements of 13.81 x 14.02 x 9.83mm. The stone shows an exceptional neon violet-blue (purplish-blue) color which is considered AAA+. Tanzanite Is a very rare precious gemstone that is only found in the Usumburu Mountains that border the Umba Valley of northern Tanzania. Originally discovered in 1967 by Tiffany & Company who named the stone Tanzanite. Tanzantite is unique due to its exceptional pleochroism (an optical phenomenon in which a stone has different colors when observed at different angles). This example is a nearly flawless eye clarity and unbelievable depth with transparent finish. The piece comes with an IGL (Independent Gemological Laboratories) appraisal which gives a retail value of $17,795.00. One of the finest trillion cut over 10 carat Tanzanite stones currently offered for sale.