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2.24ct Cobalt Coated Tanzanite and 0.84ctw Diamond Ring

Auction #1485 | Item #248

Current Bid: $900

Appraised Value: $4,660

4 Bids Placed

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One electronically tested 14KT white gold ladies cast tanzanite and diamond ring with a bright polish finish. The featured tanzanite is set within tiered diamond bezels supported by diamond set shoulders, completed by a two millimeter wide band.  Trademark is Orianne. Identified with markings of "14K". Condition is new, good workmanship.


One prong set triangle mixed cut natural tanzanite, measuring 8.30 x 8.20 x 4.50mm, 15% bulge factor, approximate weight of 2.24ct., clarity is eye clean, type I, dark, very slightly grayish, blue color, (GIA B 7/3), cut is good. Natural Tanzanite, color enhanced due to cobalt coating. The presence of the coating prevents determining the stone's actual depth of color. Transmitting light with no distortion, transparent. Grading in the setting. The cobalt coated Tanzanite has a low tolerance to ultrasonic cleaning, and should not be cleaned using this method.


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.


One Hundred Forty-Six prong set round brilliant cut diamonds, measuring 1.20 - 1.10 x 0.69mm (depth est.) approximate total weight of 146 Stones = 0.84ct. Graded in the setting.


Clarity            I-1 to I-2     
Color              H - J