This item is a blue agate slice that is approximately 3.8" long. These are from Brazil and have been dyed blue and have been polished on both sides. This would make a great coaster. Typically agate slices of this size have a thickness of approximately 3-5 mm.
Since these are dyed agate slices, we recommend not putting these on porous surfaces because the dye might bleed when wet. We haven't had any blue agates bleed, typically purple and pink, so we don't think this will be an issue.
If this agate slice were to get damaged during shipping, a full refund would be issued.
We sell agate coasters in blue, green, natural (browns/tans/grays), pink, and purple.