STACKING BANGLES Whirl bangle in 18k yellow gold with green tourmaline; $3,990; Carelle, NYC; 212-997-1156; carelle.com   Cirque collection slim hinged cuff in 14k yellow gold with 0.38 ct. t.w. pink tourmaline, 0.38 ct. t.w. citrine, and 0.19 ct. t.w. red garnet; $2,665; Jane Taylor; 413-687-3153; janetaylor.com Bangle in 18k yellow gold with diamonds and Gemfields Mozambican rubies; $3,090; Michelle Fantaci for Gemfields at Muse, NYC; 866-301-MUSE; michellefantaci.com   Bangle in 18k white and rose gold with 0.13 ct. t.w. white diamonds; $1,540; Simon G., Los Angeles; 818-500-8595; simongjewelry.com   Bangle with 3.08 cts. t.w. Blueberry Tanzanite in 14k Strawberry Gold; $3,797; Le Vian, Great Neck, N.Y.; 877-253-8426; levian.com Bangle in sterling silver with 10.23 cts. t.w. paraiba-color spinel; $700; Judith Ripka, NYC; 212-244-1230, ext. 217;