It's probably safe to assume people will know he's taken anyway.
But Prince William doesn't plan to wear a ring marking his marriage to Kate Middleton.
"There is only going to be one ring, in accordance with the couple's wishes," a spokesperson at Clarence House confirmed.
"It was something the couple discussed but Prince William isn't one for jewellery - he doesn't even wear a signet ring - and decided he didn't want to.
"It really is just down to personal preference".
Kate, on the other hand, will bear a ring fashioned from Welsh gold owned by the royal family, the palace official also revealed.
"The couple have both had a hand in the design. This is the ring Prince Harry will carry and hand over in the traditional way".