Natural Selection : Item of the week by Style.com

Maybe it's the summer sun or the lure of the parks and beaches, but when it comes to accessories, natural materials feel right for the moment. And who better to take advantage of that circumstance than Ria and Yiouri Augousti? The duo has been drawing on nature's bounty for their bags and home pieces for years, and this season, they're bringing a renewed focus to jewelry. These cuffs echo the vivid color-blocking that's taken over the runways for Fall and Resort with skins and stones in brilliant, earthy hues. Go green—shagreen, that is, and malachite, too.

R&Y Augousti malachite and shagreen cuffs, $275 (one stone) and $300 (two stones), available at Barneys New York, (212) 965-9964,
www.barneys.com