Giving her gemstone jewelry? Do not start with the stone. Start with her color. A plain-language guide to choosing by color instead of guessing a birthstone, and which stones wear well every day.
gem guide
You, A Tourmaline Expert in 5 Minutes or Less
Educational, Gemstones4 CommentsA simple introduction to tourmaline, highly favored by jewelry designers for its rich colors, sometimes several in a single stone, with insight into each type and its colors.
https://www.gemselect.com/gem-info/tourmaline/tourmaline-info.php