Set of 4 Slice Agate Coasters: Coasters come with four silicone rubber bumpers to protect your furniture and ensure that each coaster is non-slip. The agate coasters are approximately 3 to 3.5” in size. Dyed Agate Sets: Each agate set is natural agate that may be enhanced with dye to create a richer color. Agate sets come in pink agate coaster sets, blue agate coaster sets, teal agate coaster sets, purple agate coaster sets, black agate coaster sets and natural brown agate coaster sets. Unique Coaster Set: Each slice has an irregular shape and some have druzy elements and unique color stratification. Decorative Coasters: These coasters can be functionally used anywhere including the bedroom, kitchen, or office and can also be used as artistic home decor. Coaster Care: These coasters are not water absorbent and may become slippery on the top or overflow if there is standing water/condensation. You should use a damp cloth to clean your coasters if needed. Coaster Gifts: Agate coaster sets are a great gift for your friends, families and also suitable for Birthdays, Housewarmings, and other occasions. Purple Agate Coasters Natural Brown Agate Coasters Not safe for granite counters Unique Coasters Set of 4 These unique agate coasters are part of our "handmade with love" collection at Crystal Joys. The agate coasters are produced in blue, pink, teal, purple, brown, and black. There are four coasters in each set and they are approximately 3-4" in width. Each coaster has four silicone "footers" that are adhered to the bottom of the coaster to ensure they do not slip on surfaces. Agate is a rock consisting primarily of cryptocrystalline silica, chiefly chalcedony, alternating with microgranular quartz. Agate is characterized by its fineness of grain and variety of color. Agate is a 6.5-7 on the Mohs hardness scale. Although agates may be found in various kinds of host rock, they are classically associated with volcanic rocks and can be common in certain metamorphic rocks. Metaphysically, it is believed that Agate enhances mental function, improves concentration, enhances perception, and analytical abilities. Each piece is similar, though no item at Crystal Joys is exactly the same as every item is a unique stone that is non-fabricated. Slight variations in color, size and shape may exist. Every item at Crystal Joys is truly "one of a kind" due to the natural properties of the stone.