Lady's 18K White Gold Amethyst & Diamond Ring. Ring Size: 7 3/4 (Can be Resized to Fit Most Any Finger.) Contains: One Natural Fancy Cut Amethyst. Weight Approx: 15.00ct, Color: Purple, Origin: Brazil. Forty-Eight Natural Round Brilliant Cut Diamonds. Weight Approx: .20cttw, Color: G-H, Clarity: SI. A natural purple Brazilian amethyst ring weighing approximately 15 carats. It is surrounded by 48 natural round brilliant cut diamond weighing approximately 0.20 carats. This amethyst was fashioned by an old fashioned, old world cutter. The entire top piece is faceted, thusly, the piece catches the light and the scintillation is unbelievable.