Geoffrey Turk: Fire Opal, Emerald and Diamond Ring, 1977. Oval-cut fire opal. Marquise-cut emeralds. Marquise-cut diamond. 18 carat gold. Maker's mark, London hallmark. Ring size approx. J½. Weight approx. 12.0g. CONDITION REPORT: Light surface wear to 18 carat gold with London hallmark, date letter C for 1977, maker's mark GT. FIRE OPAL: Gauged in mount as approx. 17.9 x 11.9 x 8.0mm, of typical orange hue with moderate transparency, eye visible crazing to crown and pavilion facets visible. EMERALDS: Of v