Niels Østergaard Knudsen silver Brutalist ring with amazon stone - Size 57

Niels Østergaard Knudsen, Brutalist ring with amazonite stone. Hallmarked "STERLING DENMARK NØK". Niels Østergaard Knudsen was a goldsmith in Charlottenlund from 1964 to 2008. Ring size 57. Nice and well-maintained condition.