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Appraised Value: $0
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One electronically tested 18KT white gold ladies cast alexandrite and diamond ring. The featured alexandrite is set within tiered diamond bezels supported by diamond set shoulders, completed by a three and one-half millimeter wide band. Bright polish finish with milgrain detailing. Identified with markings of "18K 750". Condition is new, good workmanship.
One prong set cushion modified brilliant cut natural alexandrite, measuring 13.75 x 10.71 x 9.46mm, exact weight 12.22ct., type II Clarity is eye clean, medium dark, very slightly grayish, green-yellow color, (GIA GY 6/3) to medium dark, very slightly grayish, yellow-brown, (GIA YBr 6/3), cut is good. Transmitting light with no distortion, transparent. GIA Gemological Report attached. Graded loose prior to setting in the GIA Laboratory, Report #2171016165.
The green-yellow color was photographed under 6000K daylight; the yellow-brown color was photographed under 2000K incandescent light, see the photographs to the right.
Alexandrite was discovered in the 1830's near the Tokovaya River in the Ural Mountains of Siberian Russia. It later became the national gemstone of Russia. The name "alexandrite" became official in 1842.
Alexandrite is a variety of chrysoberyl. It contains both beryllium and chromium. It is the chromium that accounts for the spectacular color change. The color change is the primary qualification for a chrysoberyl to be considered alexandrite. Alexandrite is strongly trichroic. Its color change results in a near-equal transmission of the blue-green and red portions of the spectrum, coupled with strong absorption in the yellow. Today Alexandrite is found in Brazil, India, Madagascar, Myanmar, Russia, Sri Lanka, Tanzania and Zimbabwe.
One Hundred Six prong & channel set round brilliant & baguette cut diamonds approximate total weight of 106 Stones = 1.98ct. Graded in the setting.
Clarity VS-2 to SI-1
Color G - I
Total Weight of Colored Stones 12.22 ct.
Total Weight of Diamonds 1.98 ct.
Total Weight of Ring 11.03 gm