Silver Crystal Birthstone Ring January Garnet. These birthstone rings are a beautiful collection of different coloured crystals, which each correlate to one month of the year, and will hold meaning that is true to the wearer. Crafted in sterling silver and featuring a stunning polished finish, these birthstones will make a special personalised gift or a great treat for yourself! Pair with the matching necklace and earrings or add to our stack with our other silver rings!