J.E. Caldwell, an Art Deco emerald and diamond necklace, 1920s, the pendant of tassel design, set

J.E. Caldwell, an Art Deco emerald and diamond necklace, 1920s, the pendant of tassel design, set with circular-cut and cushion-shaped diamonds, suspending a drop-shaped emerald measuring approximately 15.8 x 13.3 x 12.3mm, to a chain necklace spectacle-set with circular-cut and cushion-shaped diamonds, necklace length 48cm, pendant length 6.2cm, signed JEC Co