This is a dark teal sapphire that has a color shift from a blue teal to a green teal in varied lighting conditions.  Its color saturation is best described as rich to dark and has the blue teal color under halogen light and the green teal color under all other lighting conditions.  The cushion cut sapphire weighs 3.10 carats, measures 8.29 X 7.73 mm, has excellent clarity and great brilliance with sparks of green, blue and teal throughout.  It is four prong set in a platinum ring that has 0.56 ctw of diamonds that are VS2 FG quality.  The ring weighs 7.57 grams and is a size 73/4 (please indicate your size request on the order form).         AGTA Gemstone Enhancement Codes N = Not Enhanced E = Routinely Enhanced C = Coating D = Dyeing F = Filling H = Heating HP = Heat & Pressure I = Impregnating L = Lasering O = Oiling/Resin R = Irradiation U = Diffusion W = Waxing/Polishing in Opaque Stones Color Symphony only sells gemstones that qualify as being natural.This includes both heated and unheated or untreated stones (with exception some blue topaz and colored diamonds may also be irradiated).  As a proud member of the American Gem Trade Association we pursue ethical business practices and disclose all gemstone enhancements or treatments to our clients.