The new video-sharing app allows you to showcase moving images—in six seconds or lessTwitter’s recent acquisition of Vine, a video-sharing app for iPhones, underscores one inarguable fact: In social media, imagery is king. Camera phones—whose capabilities and pixel count are expanding rapidly—are ubiquitous, making the creation of artsy imagery easier than ordering a cheeseburger at a drive-thru. Simultaneously, image-centric websites such as Pinterest and 500px are multiplying. Visual file sharing, it seems, is here to stay. And that’s good news for jewelry retailers, whose brilliant products represent, for many consumers, the ultimate eye candy.“Image sharing is at high experimentation levels right now and that’s because of its novelty and ease,” says social media expert and author Paul Gillin. “Over the last two years, apps and phones and websites have made sharing t