Citrine & Diamonds Ring 18kt Two-tone Gold. For sale is a gorgeous 18kt two-tone gold ladies ring in citrine and diamonds. The ring is set with an oval step cut citrine weighing (9.00cts) and five single cut diamonds (0.12cttw). The citrine is transparent and loupe clean, medium-dark slightly brownish/orange-yellow in color. The ring, size 6 1/4, was cast, handset with bright polished finish. It is in very good condition and comes with an appraisal of $1743.00.