Solitaire pendant with brilliant-cut diamond of approx. 0.55 ct,

Solitaire pendant with brilliant-cut diamond ca. 0.55 ct, ca. LIGHT YELLOW (S-Z)/I2-3, 18K white gold, 0.7 g, in former times with other stone, of that other weight is engraved, 2nd half of 20th century, signs of wear.