Call of Duty: Black Ops IIEdit
Unlock Golden Camouflage for every weapon in its category.
The Diamond Camouflage is a hidden camouflage in Call of Duty: Black Ops II multiplayer. It is unlocked for every weapon in its category after all the weapons in that category have Gold Camouflage unlocked. For example, to obtain Diamond for assault rifles, Gold must be unlocked on all assault rifles.
It seems to be an upgrade of the Gold Camouflage, as all parts of a weapon that would be covered in the synthetic black material, is instead covered with Gold, and the regular camouflaged part of the gun is camouflaged Diamond. Other camouflages that share the trait include Bacon, Paladin, Dragon and Weaponized 115.
Diamond Camo is one of the camouflages that will apply to the iron sights, which can cause a visual distraction to some players. As well, the bright white color can make characters stand out, but doesn't stand out as significantly as that of other camouflages.
For the submachine gun Diamond Camouflages, the player is not required to unlock the Gold Camouflage for the Peacekeeper. However, if the player wants to unlock Diamond Camo for the Peacekeeper, they have to unlock the Gold Camouflages for all submachine guns, even for the Peacekeeper. This is because, if the Peacekeeper was required to get Diamond for submachine guns, players that don't have the Revolution Map Pack would not be able to obtain Diamond Camouflage for submachine guns.
Upon unlocking Diamond camouflage, no XP is awarded. However, XP is still rewarded for unlocking Gold Camouflage for the weapon that it was unlocked for at the time, as well as the XP earned for the camouflage the player obtained to get the Gold Camouflage for that weapon, which can confuse some suspecting players. Technically, Gold + Challenge camo (x2 depending on the results) + calling card would equal 12500/17500 XP.
Call of Duty: Advanced WarfareEdit
Unlocked after all other camo challenges have been completed for a weapon
Diamond Camouflage appears in Call of Duty: Advanced Warfare. It requires players to get every camouflage for each weapon.
As of patch 1.04 for the PS3/Xbox 360, it is possible to "glitch" your way to obtain diamond camo much easier than the normal way. If one completes at least one camo challenge for the desired weapon, and then advances one prestige level, all of the subsequent challenge levels will sometimes unlock at the same time (ex. if the player obtains the 10 Long Shots challenges, then prestiges and gets 10 more Long Shot medals, the 20/40 Long Shot challenges would unlock at the same time, and so as the 60/80 Long Shot challenges).