January birthstones are two gemstones, garnets and rose quartz. Garnets are a group of minerals that come in a variety of colors, including red, orange, yellow, green, blue, purple, brown, black, pink, and colorless. Rose quartz is a type of quartz that ranges in color from very pale pink to deep reddish-pink. Both of these stones are associated with the month of January and are believed to bring good luck and protection to those born in this month.