Our annual JCK Retailer Survey gives the lowdown in five crucial categories of operations. How does your business compare?After three years of putting together the JCK Retailer Survey, we’ve learned a thing or two about how successful jewelers run their stores.By asking questions about their performance and tactics in five categories of retail operations, otherwise known as the 5 S’s—Store, Stock, Sales, Staff, and Salary—we’ve learned, for example, that custom design remains important to more than half of all retailers. But it’s slightly more important to those who reported higher sales in 2012. We’ve also discovered that diamond-buying is even more important to the higher-sales crowd than gold-buying.And the biggest finding of 2012? Successful retailers are more likely to have invested in advertising, social media, and promotions than their less-successful counterparts. T