New jewels at the Hong Kong Jewellery & Gem Fair, held Sept. 13–19, celebrated nature motifs and enamel. (Top) Butterfly bracelet in 18k gold with diamonds, Paraiba, and spinel; $58,000; Sutra, Houston; 713-984-4987; sutrajewels.com (Inset) Necklace in 14k gold with enamel, mother-of-pearl, and diamonds; $1,137; Roberto Bravo, Istanbul; 90-212-458-1720; robertobravo.com   Ring in yellow and white gold with a South Sea pearl and diamonds; $7,500; Yoko London, NYC; 212-819-9400; yokolondon.com   Platinum earrings with diamonds and rubies; price on request; Pioneer Gems, NYC; 212-391-4490; pioneer576@aol.com   Forest necklace in 18k rose gold with rose quartz and diamonds; $12,980; Carla Amorim, Chicago; 312-305-6476; carlaamorim.com