Diamond rank will grant you the following:

Perks:

• [Diamond] Prefix
• 3x Normal Shop Plots
• 6x Homes
• 4x Warps
• +10000 Claim Blocks
• Shops Expire After 35 Days

Commands:

• /heads - Use a selection of decorative heads
• /sit - Sit down anywhere
• /itf togglemode glow [colour] - Toggle the glowing colour of item frames
• /craft - Open a crafting table anywhere
• /near - See who is near you
• /sit playertoggle - Ride on another player
• /phead (Username) - Receive the head of any player
• /ptime - Change your personal time
• /hat - Use any block as a hat
• /pp - Set custom player particles
• Edit armour stand by using a piece of flint
• /chestsort - Toggle automatic chest sorting
• /invsort - Toggle inventory sorting
• /respawn - Kill yourself easily
• /anvil - Opens anvil
• /echest - Opens your ender chest
• /nick (Username) (Nickname)