Shelly Purdy 2013 engagement ring collection, “The Royals”, was inspired by Kate and William’s wedding. Canadian round and square diamonds are suspended in 14-karat white gold crown settings shaped like famous tiaras, while a marquise-cut diamond engagement ring features an imperial cross pointed with tiny blue sapphires. The rings stack with many interlocking diamond bands, one even reminiscent of the crenulations on the Tower of London.