Diamond Shield

Diamond Shield (ダイヤモンドシールド) is a weapon that can be used by Vexen in Kingdom Hearts 358/2 Days. It can be upgraded to Diamond Shield+. The Diamond Shield has the same physical structure as the Cryolite Shield, except that it is blue instead of pink.

Trivia
In the Final Fantasy video game series, the Diamond Shield is the shield from the set of  Diamond Equipment, and has appeared in all of the main games in the series, except for  Final Fantasy XI. It usually provides a resistance to Lightning.