A 25k Rolex I didnt give it my friends wedding the grooms gift others have been holidays other kinds of jewellery cufflinks also depends on what's the grooms hobbies could revolve around whatever is hobbies are. Are you Groomsman? Alot of people go for just something simple and small trust me it's not high on the grooms mind that day so dont stress to much on it.

Laser etched personalized Johnny walker blue bottles was a nice one I received. And they were full!