Platinum Tiffany & Co. Engagement Ring. The Set Contains: 1 Lady's Platinum Tiffany & Co. Lucida-Cut (Cut Cornered Square Mixed Cut) 0.62ct Diamond Engagement Ring. Size: 5 Color: G Clarity: VS-2 Per Tiffany & Co. Appraisal Number: N015095. Get married in style with this Genuine Tiffany platinum platinum diamond engagement ring. Several years ago, Tiffany astonished the diamond world with a new style of diamond cut which is called the Lucida. Nobody can replicate this cut without facing severe legal penalties because the cut is patented. So whenever you see somebody wearing one of these you know they are married to a high roller who paid the points to get the best.