Birthdays are the ideal time to buy Birthstone Crystals, Bracelets & Necklaces. The Capricorn birth sign lasts from 21st December to 19th January and is the tenth astrological sign in the Zodiac. The important crystal Obsidian is presented in a gift box making an ideal present for those born under the sign of Capricorn. Each crystal used in Birthstone Bracelets and Necklaces have been chosen according to their Zodiac alignment and beauty. The properties of Obsidian Bracelets and Necklaces are believed to portray the characteristics of the Capricorn sign. Birthstone Bracelets and Necklaces can be worn for special occasions or as part of everyday wear, they will brighten up your outfit nicely too as an added bonus.