Masterpiece London returns to the South Grounds of the Royal Hospital Chelsea this June to showcase the finest in art, jewels, horology, antiques and design. Now in its fourth year, collectors, exhibitors and curators will gather from around the world to celebrate the world's most exquisite creations under one roof. With 23 of the 163 exhibitors showing jewels and watches - both old and new - this week-long event is a must-visit.