This will not shock you if you read either the title of this entry, or the hyperbole above: this is by Cartier.
Cartier created this beauty in the 1940's. It centers a cushion-cut diamond, with two concentric old mine and old European-cut diamond hexagonal-shaped surrounds. On either side of the center diamond, the bracelet continues with four graduated, overlapping open hexagonal old European-cut diamond links, each segment set with an old European-cut diamond 'Lily of the Valley' motif. These are enclosed by a border spaced by collet-set diamonds, all set in platinum. It is accompanied by a Cartier case and certificate of authenticity, numbered NY2008-5, circa 1940.