Stromatolite, also known as Turtle Shell Agate or Turtle Agate, is a dark brown stone with waves of lighter brown and tan inclusions resembling a turtle shell. In jewlery design, Stromatolite looks best with gold metals. This stone looks great with dark brown or black gemstones like Bronzite, Smoky Quartz, Black Obsidian, and Onyx. Stromatolite is found on the coastlines and beaches of Mexico, Brazil, and the Bahamas. Metaphysically, Stromatolite is believed to hold healing properties that help us accept and embrace our emotions. This stone is also said to encourage gratitude and inner contentment.