This is a guide to optimising physical and psychological well-being through the use of gemstones, with reference to the disciplines of Tantra an Ayurveda. The author discusses how Indian astrologers, Ayurvedic healers and Tantric alchemists use gems in their practices and provides clear instructions for the creation of gemstone talismans and the performanc of rituals involving gems to bring about desired effects. The book serves as both a practical guide to the subtle nature of gemstones and as an overview of their use through the ages. The introduction looks at gemstones and the human race and gems and astrology, while Part 2 deals with particular stones and their ruling planets: ruby, pearl, coral, emerald, yellow sapphire, diamond, blue sapphire, hessonite and cat's eye. There is also a chapter on semi-precious stones and gems of medicinal value plus one devoted to healing with gemstones. It was interesting to learn that gems work with both Physicochemical and Pranic energy, whether the are worn as jewelry or taken orally in the form of pastes or oxides. Beautiful illustrations, Sanskrit script and figures enliven the text and there are many tables and astrological charts.