Cobalt Blue Sliced Agate Coasters - set of 4 - GEMS ROCK exclusive! Set of 4 Sliced Geode Agate Coasters from GEMS ROCK - Exclusive! Vivid Blue- Actual product may vary. Photo is representative. Unique Decorative Item for Entertaining With rubber "feet" on bottom to protect furniture surfaces and prevent slippage Great Gift! Large 3.5"-4"