January Birthstone and also a zodiac stone for Capricorn -the garnet is closely related to the Ruby and Emerald family and can be in colours from deep green through to the deep red/purple that we love to use in our jewellery.  The photos don't show the colour off well but they are stunning in real life.
 
All hypo-allergenic.  
 
Garnet is a stone of purity and truth, protecting you on trips, and showing true friendships.  They are also known for stimulating success in business - If your business is not as good as it should be, just put 3 or more garnets on your desk.