1ct Platinum Round Diamond Solitaire Engagement Ring in SuperJeweler's Finest Engagement Ring Quality. Our 4 star diamonds are G/H color, SI1/SI2 clarity, which are fine top white, highly brilliant and fully eye clean. Brand: Superjeweler Design: Novelty Style: Solitaire Resizable: Yes Adjustable: Yes Size/Dimensions: 4 Metal Stamp: 900 Platinum Diamond Color: G-J