Old diamond necklaces are our kryptonite, so when we discovered this Deco-era beauty we knew she belonged in our collection. Crafted in icy and weighty platinum, this necklace brings together Old European cut diamonds and baguette cut diamto create an elegant line necklace with so much sparkle and fire. We love the differing components and diamond cuts all lined up with one another, adding visual contrast in a way that is still cohesive and beyond beautiful. We'd love to see this baby worn…