Baselworld 2011 featured a few standout collections rich in color, craftsmanship, and imagination.1. (above) Earrings in 18k gold with rubies, diamonds, and amethyst briolettes; price on request; de Grisogono, Geneva; 41-22-817-8100; degrisogono.com   2. Autumn ring in 18k gold; price on request; Jewellery Theatre, Moscow; 74-95-789-6868; jt.ru  3. 18k gold snake pendant with 134.86 ct. emerald; $1 million; Zannetti, Rome; 39-66-819-2566; zannettiwatches.it  4. 18k gold duck ring with yellow diamonds, blue and orange sapphires, and blue topaz; price on request; Chopard, New York City; 800-CHOPARD; chopard.com  5. 18k white gold flower brooch with Tahitian keshi pearls and diamonds; $39,540; Yvel, New York City; 866-983-5583; yvel.com