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LONDON, ENGLAND - FEBRUARY 22: (EDITORS NOTE: Retransmission of image #511688766 with alternate crop.) Dianna Agron, ring detail, attends the Erdem LFW AW16 show at The Old Selfridges Hotel on February 22, 2016 in London, England. (Photo by Darren Gerrish/Getty Images)

LONDON, ENGLAND - FEBRUARY 22:  (EDITORS NOTE: Retransmission of image #511688766 with alternate crop.) Dianna Agron, ring detail, attends the Erdem LFW AW16 show at The Old Selfridges Hotel on February 22, 2016 in London, England.  (Photo by Darren Gerrish/Getty Images)