Jewelry designer Marie-Hélène de Taillac will tell you that not only are diamonds a girl's best friend, but they also offer protection from negative forces—just as rose quartz reinforces self-confidence and amethyst promotes spiritual growth. Respectful of gemstones' healing and energizing properties, de Taillac creates whimsical yet deeply expressive bijoux, simple designs that set off and celebrate a wide variety of beautifully cut stones. Now displayed at Colette, on Paris' fashionable Rue St.-Honoré, de Taillac's jewelry is handmade in Jaipur's legendary Gem Palace, where she spends seven months each year experimenting with uncut gems. Her current collection includes a stunning rectangular-cut emerald ring with unadorned gold band ($7,250), as well as the 22-karat-gold chain necklace with aquamarines and colored tourmalines ($6,400). At 213 Rue St.-Honoré; 33-1-55-35-33-90. Select pieces are available at Barney's New York and at Browns in London.