Signed Gorski Designer Necklace Mid Century Brutalist Art Deco Shape

Gorgeous piece,marked Gorsk I think the I is worn, but it's Gorski. Heavy solid in a brutalist  style, but Art Deco shaped. It can take different sizes chains as the hole is large. The square stone is crystal glass. The pendant measures approx 6.75x2.5cm. Circa 1960s, great piece ! Thanks for looking:-)