Featured in this lot is this 4.66 carat tanzanite diamond and 18k white gold ring with AIGL paperwork. The ring features a wonderfully and professionally crafted polished, stamped and tested 18k white gold construction with a bright finish and shows a 'Orianne' hallmark with a 18k gold stamp next to the hallmark. The center stone is a pear modified brilliant cut natural tanzanite gemstone with measurements of 13 x 9.8 x 5.7mm and a total weight of 4.66 carats and shows violetish blue coloration and a very good cut grade. The center stone and pave shoulders are profusely decorated with a total of 36 round brilliant cut diamonds that measure 1.2 - 1.5mm and a weight of 0.48 carats and shows a clarity of VS2 - SI1 and a color gradient of G - H. Tanzanite is an exceedingly rare precious gemstone that is only found in the Usumburu Mountains that border the Umba Valley of northern Tanzania. It was originally discovered in 1967 by Tiffany & Company, who named the stone Tanzanite. This example is unique due to its exceptional pleochroism (an optical phenomenon in which a stone has different colors when observed at different angles). The piece comes complete with AIGL Inc.(American International Gemological Laboratories, Inc. a GIA certified lab AIGL#: K68D99-EA 14727) report and appraisal confirming the above info and giving a total value of $20,697.00. The ring size is US 7.