A, E, I, and U means nothing without O. O Thongthai, that is. The Central Saint Martins alumnus launched her brand at London Fashion Week in 2014. Describing jewellery as 'something that is supposed to last forever,' O's signature iced signet rings have been known to sit rebelliously on the pinkys of A$AP Rocky and Pharrell Williams. Look out for rainbow gems, sparkling diamonds and zodiac-inspired pendants that will make you Happy too. Shop the edit below.