Bangle with aquamarine and diamond

Bangle with aquamarine cabochon ca. 25 ct and brilliant-cut diamond ca. 0.5 ct, ca. WHITE (H)/VS, 2 raw diamonds ca. 4+5 mm, 18K YG+palladium 950, 78.9 gr, inner circumference ca. 18 cm, 2nd half 20th century, minor signs of wear, clasp difficult to open (lift instead of push).