An American ­TraditionNot only is June a traditional month for weddings, it’s also, by industry convention, the time when bridal jewelry manufacturers debut their new lines. Keep an eye out for these new styles in Las Vegas.Celebrate Good Times! Ostbye’s 8-year-old bridal jewelry collection, Celebration, is getting a timely update this year. Fifty SKUs—25 engagement rings and 25 bands—are new for 2011. Engagement rings in 10k or 14k gold, platinum, or palladium can accommodate center stones up to 0.40 ct., with melee bulking up the overall appearance. Design inspirations are both classic (think prong settings and split shanks) and contemporary, the latter achieved by sculpted accents, high-polish finishes, and bezel settings.(From left) Semi-mounts in 18k gold with 0.29 ct. t.w. pavé and 0.10 ct. t.w. side stones, $2,500, 0.33 ct. t.w. melee and 0.17 ct. t.w. side stones, $2,70