18 carat gold necklace and pendant with green Colombian emerald and diamonds

18 carat gold necklace and pendant with green emerald and diamonds. Hallmarked "Au 750 E2 18ct. d 0.30 ct.". The emerald is from Colombia and has a nice dark green color. The chain measures 44.0 cm., the pendant measures 1.3 by 0.9 cm. The emerald measures 0.9 by 0.6 cm. There are 0.3 carat diamonds. Very well kept condition.