Cartier, a diamond-set 'Trinity' necklace, the pendant with three interlocking bands in white,

Cartier, a diamond-set 'Trinity' necklace, the pendant with three interlocking bands in white, yellow and rose gold, the yellow band set with brilliant-cut diamonds, on a fine link gold chain terminating in a trinity band set with diamonds which can be moved to extend or shorten the necklace, length 46cm, signed Cartier, stamped 750, numbered XC8634