A timeless Tiffany & Co trilogy sapphire and diamond engagement ring. The classic, platinum 3 stone arrangement centers on a velvety, vibrant royal blue 1.17 carat oval sapphire and is flanked by a pair of scintillating icicle baguette diamonds. Known for their use of only the finest gems, this pre-loved beauty comes with the original Tiffany document from 2018 stating a retail update of $12,500. If you're shopping for a sapphire gemstone engagement ring, you would be hard pressed to find a finer one at such a good value.