Green Sand Beach
Hawaii's Papakolea Beach is one of only 4 natural green sand beaches in the world.
These are not green gemstones. They are magnified grains of sand.
Photo courtesy of: Wasif Malik, CC BY 2.0 https://commons.wikimedia.org/wiki/File:Hawaii\_Big\_Island\_Kona\_Hilo\_522\_(7025397035).jpg