These tumble key rings are made from coloured agate ,as well as blue aventurine. The colour of the agates is distinctive because … agate does not grow in these colours. They have been coloured in Brazil. Blue and green are the colours that we were told that do not fade in the sun so the other colours may fade over time. The blue aventurine is natural colour.
Key rings like these are quick and simple way (or excuse) to have crystals with you. Many people buy them as little gifts to give as Thanks or Kris Kringle.