Unique ring with dragon's tooth pearl and diamonds totaling approx. 0.15 ct,

Unique ring with fresh water cultured pearl, in different colours, ca. 2.4x1.6 cm and 3 brilliant-cut diamonds totalling ca. 0.15 ct, TIN-YELLOW, 18K yellow gold, 11 g, ring size 58, late 20th century, signs of wear, with unknown maker's mark.