We have all seen this blue-green mineral used in native american indian rings. The stones are often marbled with darker veins or spots, adding interest to any ring. Turquoise is also one of December's birthstones and is said to spread happiness and wealth to those who receive a ring set with the gemstone. For these reasons, it is popular as a gift. Whether you are buying for yourself or as a gift, and below for a selection of mens turquoise rings.