Name of the plugin you want: ElementalGems
Spigot Link: https://www.spigotmc.org/resources/%E3%80%8Belementalgems-1-8-1-16-1-gem-shops-upgrades-api-mysql-unlimited-rewards-more-%E3%80%8A-40-off-sale.80556/
Price: $6
How it would contribute towards the betterment of the community: Top quality...