“Cupping is so 2015; it’s all about crystals now. This primer by natural beauty company Sjal cofounder Kristin Petrovich will get friends up to speed on the latest holistic trend.” — Marie Claire
“Kristin Petrovich, cofounder of the cult gemstone-infused skin-care line Själ Skincare…details how her own struggle with thyroid issues convinced her of their curative abilities…[her book] features some 200 pages’ worth of [treatments], from instructions on how to make your own skin elixirs…to acupressure treatments for puffiness.” — Vogue.com
“[Kristin’s] book is a sort of how-to guide for people interested in learning more about the connection between gemstones and skincare. It expands on Själ’s story and also includes recipes for homemade skincare treatments, like a calming amethyst tonic and a charcoal and silver detox mask.” — Racked.com