A fabulous 1960s brutalist style silver-coloured costume jewellery necklace... 
It is a series of pointy curved diamond shapes in layers and concentric squares, in a diamond-shaped arrangement. The shapes alternate between concave and convex, with some textures and cross lines. Cast bright silver tone metal / coated with a silver finish. It is a typical costume jewellery piece - apx from the 1960s era. No maker's marks, but it is stamped with some numbers to the reverse '1637', possibly by Sphinx.
It's a good statement size at 60mm x 60mm, and 3D and layered at 1.5cm deep. The pendant is on an original vintage 26" silver coloured steel chain which just slips on (very typical of the time).
It's great for its age - looks great on! A striking true-vintage necklace, perfect for a costume jewellery collector and as a retro/brutalist statement!
Includes P&P and presentation box to the UK.