Featured in this lot is this elegant tanzanite VS1 diamond and platinum ring with AIG and GIA paperwork. The ring features a wonderfully and professionally crafted platinum construction that shows a 'Orianne' hallmark and is marked 'PT950' next to the hallmark and shows on the other side of the ring band 'TA 5.51ct and D 1.38ct.' The center stone is a prong set pear modified brilliant cut tanzanite gemstone that measures 14.38 x 9.83 x 6.29mm and shows eye clean clarity and is considered type I with medium dark moderately strong violetish blue color with a good cut grade and transmits light with no distortion and a total weight of 5.51 carats. The centerstone and split shoulders are decorated with a total of 80 prong set round brilliant cut diamonds that shows a clarity of VS1-SI1 and a color gradient of G-I and a total diamond weight of 1.38 carats. Tanzanite is a very 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 AIG(American International Gemologists, a GIA certified lab AIG Appraisal Number#: 000716139050) report and appraisal confirming the above info and giving a total value of $18,990.00. GIA (Gemological Institute of America) Identification Grading Report#: 2175378784. The ring size is US 7.