Have seen it in mags but was in London last weekend and spied it in the window of a jewellery shop that was beside the Royal Academy of Art. It's a gold band with a square cushion cut stone. It comes in different colours, teal, pink, purple etc. brand begins with "P" and it's a strange name that I just can't remember! Should have paid more attention. Thinking it might be a potential 40th birthday present! All help gratefully received 