3 Answers. Well, his 'normal' Power level would be 32,500. With the "Demon Mark" it is at 56,000. After his revival, his 'normal' power level was at 60,000.
Meliodas「メリオダス」 is the Dragon's Sin of Wrath and captain of the Seven Deadly Sins, formerly the owner of the renowned tavern Boar Hat, and is the main protagonist of the series. His Sacred Treasure is the Demon Sword Lostvayne and his inherent power is Full Counter.
Excellent, CapableCPK >1.67 (Excellent, Capable)
A realistically functional diamond sword would be made on the same principle. A regular steel sword core, and diamonds coated on the cutting edges. It would look like a regular sword with possibly a band of odd colouration along the edges.