( CNN ) -- A painting by pop artist Roy Lichtenstein , which has not been seen in public for more than 30 years , and a massive pearl once owned by Mary Tudor have been unveiled as the highlights of London 's Masterpiece art fair . The artwork , `` Puzzle Portrait , '' was created by Lichtenstein ( 1923-1997 ) in 1978 , before being sold directly to its current owner , who kept it out of the public eye for decades . The super-sized pearl , which weighs 64.5 carats ( 258.12 grains ) , once belonged to England 's Mary I ( 1516-1558 ) . The monarch was painted wearing it in several portraits , now in the Prado in Madrid and the National Portrait Gallery in London . `` It is a true natural masterpiece , '' said Nazy Vassegh , the event 's CEO . `` It is one of the world 's largest natural pearls , and on top of that it has royal provenance . Pearls of this heritage are very rare . It is part of history . '' The jewel disappeared in the late 16th century , and was missing for hundreds of years , before being rediscovered in 2004 ; following extensive research , it has only recently been identified as the Mary Tudor pearl . Interactive : Rembrandt 's 'Night Watch ' explained . Organizers of the fair say the pearl and the pop art are likely to be among the most sought-after pieces for sale at Masterpiece 2013 . The only fair of its kind taking place at the height of London 's arts and social season , the show is held in a purpose-built pavilion in the grounds of the Royal Hospital at Chelsea . Held annually since 2010 , Masterpiece offers shoppers and curious visitors the chance to get up close to -- and even take home -- museum-quality art and artifacts . More than 160 dealers , galleries and workshops will display antique furniture and classic cars , precious jewelery , ancient sculptures and contemporary video installations . `` The idea is that there is a bit of everything , but that it is all pretty special , '' explained Vassegh . `` We have works from the 6th century B.C . and even earlier , right through to a Bill Viola , and everything is of an extremely high quality . '' Each work has been vetted by one of 26 committees of experts , to ensure the highest standards across disciplines , and some of the biggest names in art , from Albrecht Duerer and Nicholas Hilliard to Pablo Picasso and Joan Miro will be on view . Note : Masterpiece London takes place in the grounds of the Royal Hospital Chelsea from Thursday 27 June until Wednesday 3 July . Follow the fair on Twitter @ MasterpieceLndn # MPL13 .
A rarely seen work by Roy Lichtenstein is to be on display at London 's Masterpiece art fair . Created in 1978 , the ` ` Self Portrait '' has been kept out of the public eye for 30 years . Also on display is a super - sized miniature one owned by England 's Queen Elizabeth I .