Niels Østergaard Knudsen silver Large Brutalist Pendant with Green Stone

Niels Østergaard Knudsen, large sterling silver brutalist pendant with green stone that is probably a peridot. Stamped “STERLING NØK 2241971". Niels Østergaard Knudsen was a goldsmith in Charlottenlund from 1964 to 2008. Length 7.5 cm., width 4.8 cm. Excellent condition.