Wondering what to look for at JCK? Let these Vegas-bound retailers be your guides.Attendees heading to this year’s JCK Las Vegas are feeling pretty good. With the economy on better footing, gas prices and unemployment rates down, and jewelry sales moving along at a healthy clip, buyers who spoke to JCK prior to the show say they have high hopes for the remainder of the year and beyond.Official forecasts underscore their mood: Personal consumption expenditure on jewelry and watches is expected to reach $102 billion by 2020, marking 4 percent year-over-year growth from 2013, according to a study by industry consultant Diamond Shades. The growth in sales is already being realized by many, according to JCK’s informal poll of retailers.“I think we feel way better about the industry than we thought we would five years ago,” says John Henne, president of Henne Jewelers, in Pittsburgh. �