(TrendHunter.com) The Jewelers International Showcase — also known as JIS — is holding its Spring event in Miami Beach from March 8 to 10. The event has positioned itself as a key sourcing hub for the jewelry…(TrendHunter.com) The Jewelers International Showcase — also known as JIS — is holding its Spring event in Miami Beach from March 8 to 10. The event has positioned itself as a key sourcing hub for the jewelry…