An early 20th-century diamond pendant with diamond necklace

An early 20th-century diamond pendant with diamond necklace, the Art Deco pendant with Belle Époque influence, stylised Greek key-pattern upper section, set overall with rose-cut diamonds, the four festoons of foliate and plain links suspending a diamond-set tassel, the principle diamond set with two smaller diamonds to the upper section, the necklace designed as an articulated row of circular-cut diamonds, all set in platinum, pendant 9cm, necklace 65cm, fitted case