Platinum ring - Champagne diamond 3,10 ct

Ring and ring head made of platinum. Purity Pt 900/1000. Total weight 6.24 grams. Ring at the bottom, smooth. In the upper part, cut with six crowns (three on both sides) with set diamonds of a round brilliant cut weighing 0.20 ct, color H., clarity Si. , brus G.. Raised crown of the ring, pyramidal, with a large central diamond of a round diamond cut, dimensions 9.25 - 9.28 x 5.57 mm. , weight 3.10 ct, color - tinted O Champagne C1, purity Si2, cut G, fluorescence N.. Ring size 53. Manufacturer's mark, Czechoslovak hallmark (coronation crown). Expert opinion.