I have also seen similar centerpieces that use epsom salts instead of sugar. You could also sprinkle a mix of pearls/gems. Sand (or sugar), faux pearls, a 3 candle. An easy DIY wedding centerpiece idea.
Mason Jar Centerpieces Tied Together; gold and teal ribbon with white flowers - inspiration! My vintage blue jars tied together with the dark blue lavender in them for my centerpiece on the dining table!