Navy Blue Fake Ice Rocks, 150PCS Acrylic Gems Crystals Plastic Diamonds Centerpiece for Vase Fillers DIY Craft Wedding Party Table Scatter Aquarium Tank Cobalt Blue Decorations. Scattered across a light-colored table, these royal blue crystals instantly create a sense of luxury, reminiscent of scattered blue diamonds, while being effortless to clean and collect after the gala.