An-emerald-is-as-green-as-grass__A-ruby-red-as-blood__A-sapphire-shines-as-blue-as-heaven__A-flint-lies-in-the-mud_____A-diamond-is-a-brilliant-stone__To-catch-the-worlds-desire__An-opal-holds-a-fiery-spark__But-a-flint-holds-fire