21st Century Diamond Tiffany & Co. Band Rings. From our unique collection of Contemporary Rings, this Tiffany & Co. piece is offered for sale online by Benchmark of Palm Beach. Global shipping is available. One pair of 18K yellow gold, channel set eternity bands by Tiffany & Co, flanking a beautifully high polished 18K yellow gold band also by Tiffany & Co. Each diamond band is set with approximately 1ct of overall F color and VVS2/VS1 clarity, round brilliant cut diamonds, and the gold band has a design comprised of lozenge shaped rises, that gives it detail, yet remains sleek. With all three bands stacked together, it gives 1 inch of coverage to the finger that will accommodate a size 5 1/2 finger.