Diamond longsword

Diamond longsword is considered to be one of the best Diamond weapons avaliable, since it has 2 powerful types of attackstyles. There two ways of obtaining the sword: Buying it from the Grand Exchange or recieving it as a rare drop from Metallic Experiments. Many Metal dragons have a strong weakness to Diamond weapons aswell as stab attack, this leads to even more uses of the Diamond longsword because of it's high strength and stab attack bonus. It also comes with a special attack. The highest known max hit of the sword is thought to be 796 Lifepoints, if used in a perfect condition with the right equipment/potions/prayer.

Special attack
The special attack is called Cut glass, which causes the player to do a slow but powerful stab in a similar position as Vesta's longsword. The special attack has an increased strength and is fairly accurate. Once hit, 10% of the damage dealt will drain the opponent's Attack/Strength/Defence level randomly, alternatively if used on a monster, it decreases it's defence on Stab and Slash.

History
Diamond weapons were released on (Never), when the slayer extension was released. During it's release, Diamond longsword's price started at 1M, but steadily rose to a peak of 11 million coins because of it's bonuses aswell as being a weakness to Metal dragons, however the Diamond twinhammers never changed in price. After a while, the longsword dropped from 11 million coins to 3 million after a 6 months, continuing to slowly decrease in price.