The octagonal shape of the Gem Placemat pays tribute to its precious stone namesake. Layers of iridescent blue tones are reminiscent of how a faceted gem reflects colours, while the acrylic material makes it easy to wipe down after use. Shop matching Gem Coasters. Crafted from acrylic, these placemats are prone to scratching. To preserve the finish, a removable protective film has been placed on the surface of each coaster.