Combine lemon quartz with any gemstone to create your own unique family keepsake with the birthstones of your loved ones, or your favorite combination of colors. Lemon Quartz is known as the gem of and is the birthstone for the month of November. Tanzanite is known as the gem of positivity and energy and is the birthstone for the month of December. Join these gems together to create a unique family keepsake representing the birthstones of your loved ones. You are currently viewing the items below in 14K White Gold.