premise: Van Cleef & Arpels is a French jewelry, watch, and perfume company. It was founded in 1896 by Alfred Van Cleef and his uncle Salomon Arpels in Paris. Their pieces often feature flowers, animals, and fairies, and have been worn by style icons such as Farah Pahlavi, the Duchess of Windsor, Grace Kelly, and Elizabeth Taylor.
hypothesis: Van Cleef & Arpels was favoured by royalty
reason: The context says that the their pieces was worn by the Duchess of Windsor, and Grace Kelly, who are both members of European royalty. So it is true to say they are favoured by royalty.  It may be hard for the system as it may not know that the Duchess and Windor and Grace Kelly have royal connections