Emerald rank will grant you the following:

Perks:

• [Emerald] Prefix
• 3x Normal Shop Plots
• 5x Homes
• 3x Warps
• +5000 Claim Blocks
• Shops Expire After 30 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