C. 2000. Presented by our Estate collection, this vintage ring offers a stunningly modern look. The vibrant centerpiece, a .79 carat square … C. 2000. Presented by our Estate collection, this vintage ring offers a stunningly modern look. The vibrant centerpiece, a .79 carat square sapphire, is illuminated by a halo of .52 ct. t.w. baguette diamonds, which are arranged diagonally to create a sharp, striking look. Crafted in polished platinum. 3/8" wide. Diamond and sapphire halo ring. Exclusive, one-of-a-kind Estate Jewelry.