CLOCKWISE FROM TOP LEFT: Parentesi cocktail ring in 18k pink gold with citrine and diamonds, Bulgari ($10,400).Crystals, CityCenter, 702-583-4747. Bubble cocktail ring of 18k gold and diamonds with laser-cut lemon quartz,Madstone ($3,200). Rocks the Jewelers, Hard Rock Hotel & Casino, 702-693-4445. Flower ring with cushion-cut pink spinel and diamonds in 18k gold and platinum, Jean Schlumberger for Tiffany & Co. ($45,000). Via Bellagio, 702-697-5400. Monaco ring in 18k yellow gold, diamonds, and amethyst, Judith Ripka ($5,800). The Forum Shops at Caesars, 702-792-5900

As its name implies, the cocktail ring, which rose to prominence during the 1940s and ’50s, was tailor-made for parties, holiday and otherwise—think about it: No matter whether the gathering is convivial or boisterous, chances are you’ll be holding a Champagne or martini glass aloft, a moment that always looks better with a bit of bling on the third finger of your right hand. With fashion trends firmly rooted in bright, brilliant colors, the season’s selection of finger baubles is sure to be the toast of this cocktail-driven town.