Diamond Necklace, an unbeaten juvenile daughter of St Mark’s Basilica, won the Group 1 Qatar Prix Marcel Boussac under Belgian jockey Christophe Soumillon.

The 11/10 favourite, owned by the Coolmore partners, was a one-length winner over Green Spirit (9/4), with Narissa (10/1), a length and a quarter further back in third.

Puerto Rico brings up Group 1 double

Puerto Rico (3/1) gave handler Aidan O’Brien a 10th success in the Group 1 Qatar Prix Jean-Luc Lagardere, a Breeders’ Cup “Win And You’re In” for the Juvenile Turf.

This two-year-old son of the recently deceased Wootton Bassett had two and a half lengths in hand on Nighttime (5/1) at the winning post, with a further length and a quarter back to the race favourite Rayif (7/4 favourite) in third.

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