Tiffany & Co. 2.56ct E/VS1 Triple XXX Round Brilliant Cut Diamond Engagement RingSee all: Tiffany Engagement Rings. A truly stunning E VS1 2. 56ct Tiffany & Co. Round Brilliant Cut Tiffany Setting Engagement Ring in unworn condition. There is, perhaps, no better way to propose than with this classic Tiffany & Co. ring. This example is in incredible Proposal Ready condition. The diamond itself has dramatic fire and sparkle. It is also a rare 'Triple X', which means it is graded as having excellent cut, polish and symmetry. Our