Diamond Plate

Diamond Plate is an armor made of Diamond, the most endurable natural material found on Earth.

In Castlevania: Symphony of the Night, it it the strongest non-enchanted armor. It gives a Defense boost of +15, which is higher than Platinum Armor (+10). It has the same as Dark Armor (resists Dark), Axe Lord Armor (turns its wearer into an Axe Armor), and only less than Alucard Mail (+20, resists Fire, Lightning, and Ice).