Airbus A380 laser engraved onto genuine Rolls Royce RB199 aircraft engine compressor blades made into a lovely cufflink set complete with display box (second image is an example).
 
These compressor blades are genuine Rolls Royce RB199 blades and have been in service with the Royal Air Force on a Panavia Tornado F.3. They have flown at Mach 2, twice the speed of sound which is an incredible piece of engineering. Cleaned and polished, they have a lovely finish.