Diane Kordas 18-Karat Rose Gold Triple Cosmos Ring with Shield Dangle Charm in White Diamonds. Diane Kordas\' \'Cosmos\' collection references a host of iconic movements, from geometry to Pop Art. One of our favorite pieces is this 18-karat rose gold ring that\'s made to look like three stacked styles and dotted with white sparkling diamonds. We love how the signature \'Shield\' charm dangles playfully.