A pair of tanzanite earrings makes for an unforgettable gift. A rare and precious gem, tanzanite is sure to please. White topaz is a popular substitute for the birthstone of April, which is diamond. A pair of white topaz earrings is an affordable alternative to expensive diamond studs. Tourmaline is known as the gem of love and commitment. Buy her a pair of pink tourmaline earrings to seal the deal!