An important art deco ruby and diamond necklace, by Cartier, circa 1925 The Egyptian revival necklace designed as a series of fifteen cushion-shaped rubies graduating in size to the center, each within a geometric surround of brilliant and baguette-cut diamonds forming a tapering plaque, the backchain of shield and circular linking pavé-set with similarly cut diamonds, the largest to the center, diamonds approximately 30.00 carats total