Platinum 0.43ct Diamond Solitaire Engagement Ring - Natural Diamond

This is a gorgeous vintage solid platinum (PLAT hallmark) engagement ring. Based on the hallmark, it was produced by Blue Nile. The natural diamond was appraised/evaluated to be a 0.43 ct round brilliant cut. It is 4.61 mm wide, SI2 clarity and I color. The setting is a solid platinum solitaire with four claws and high shoulders. It is sized to a 5.25 - 5.30, but can be resized by any goldsmith. It is currently in excellent presentable condition. I have had it polished by a reputable goldsmith. 4.30 g total weight.