A thousand pound reward is being offered for information on a missing diamond and sapphire engagement ring.

The cash is being offered 10 days after bride Caroline Granshaw discovered the unique ring had been stolen from Wisborough Green church porch on her wedding day.

Detectives have traced the ring's last known location to Highcroft Villas, Brighton, at just after 7pm on Saturday June 7.

It had been placed in a black L K Bennett clutch bag with gold clasp, along with an iPhone which was on. Using the 'Find my iPhone' application, police were able to track the phone's movements, showing it had been taken to Haywards Heath until around 6pm when it travelled to Brighton.

Mervyn Granshaw, father of the groom James, said: "The ring is a 3.08ct. royal blue sapphire with the shoulders set with diamonds. It has three marks stamped into the inside of the band: the London assay office hallmark of a lion's head, '950' indicating 95% platinum and, most uniquely, the maker's mark 'I&R' for Ingle & Rhode.”

PC Mathew Willcocks of Sussex Police said:"We have traced the phone's movements to Haywards Heath, Poynings Drive, Hove; and finally to Highcroft Villas in Brighton where it was turned off.

"Our investigations have led us to believe that a silver '53' registered Peugoet 206 has followed that route and we would appeal to anyone with information to contact us.”

Anyone with information should contact police on 101 or email 101@sussex.pnn.police.uk or the independent charity Crimestoppers anonymously on 0800 555 111, quoting serial 1265 7/6.