One electronically tested 18KT white gold ladies cast tanzanite & diamond ring. Condition is new, good workmanship. The featured tanzanite is set within a diamond bezel, supported by diamond set shoulders, completed by a one and one-half millimeter wide band. Bright polish finish. Trademark is HANA. Identified with markings of "18K". One prong set rectangular standard step cut natural tanzanite, measuring 8.90 x 7.00 x 4.69mm, approximate weight of 3.06ct., clarity is eye clean, type I, medium dark, slightly grayish, blue color, (GIA B 6/2), cut is good. Transmitting light with no distortion, transparent. Naturally occurring internal & external characteristics are present. Graded in the setting. Tanzanite is a very rare gemstone that is only found in the country of Tanzania. Originally discovered in 1967. Tiffany & Company, named the stone Tanzanite. It is found in the Usumburu Mountains that border the Umba Valley of northern Tanzania. Tanzanite occurs in gray, brown, violet, blue, reddish-purple, & green. The gem is interesting because of its exceptional pleochroism. Rotated in different directions a tanzanite will exhibit multiple changes of color. Tanzanite has a low tolerance to ultrasonic cleaning, and should not be cleaned using this method. Thirty-two prong set round brilliant cut diamonds, measuring 1.90 - 1.70 x 1.17mm (depth est.) approximate total weight of 32 Stones = 0.76ctw. Graded in the setting. Clarity SI-1 to I-1 Color F - H Total Weight of Colored Stones 3.06ct. Total Weight of Diamonds 0.76ctw. Total Weight of Ring 4.30 gm Size: 7