Achievement: Diamonds to you!
Description: Throw diamonds at another player.
Achieving this achievement is also possible by giving a diamond to another mob. Also, you just need to give ONE diamond, not more.
Suggestions for achievement description change:
Throw a diamond at someone.
Throw a diamond at another player or monster/mob.
Make someone hold a diamond of yours.
Erik Broes
Either the achievement should require at least 2 diamonds, or its name should be changed to "Diamond to you!".