Citrine, the sunny yellow to red-orange birthstone of November also shared with topaz. Sometimes mistaken for the equally as gorgeous yellow topaz. It is a variety of the quartz crystal family and has been used in jewellery since ancient times. Its strength and durability means that it is practical and dependable. The warmth in this stone has been known as a ‘gift from the sun’ Gifted on a 13th wedding anniversary. Mohs scale of mineral hardness: 7