“Diamond Necklace is a lovely filly who has danced every dance,” Aidan O’Brien, her trainer, said. The only names ahead of Diamond Necklace in the Arc betting are Daryz, last year’s winner, and O’Brien’s best three-year-old colt, Constitution River, already the winner of the French Derby and Eclipse Stakes this year. He’ll get all the options and at the moment, he’s going to York [for next month’s International Stakes].” “He is a baby of a horse,” O’Brien said. Goodwood 4.10 A drop in grade for Joseph O’Brien’s Galen and a repeat of his form when fourth at Royal Ascot last month could well be enough.