Important solitaire ring in white gold and diamond

MATERIAL: white gold and diamond DESCRIPTION: important solitaire ring with an old european cut diamond center mounted on a higt base with a semicircle pattern MEASURES: ring 6.5 WEIGHT: diamond ct 4.75 (average diameter 11.21 mm, H 6.32 mm), color J-K, SI1 clarity, nik on the girdle, gr 4.2