The following post was originally featured on Thou Swell  and written by blogger Kevin O'Gara  who is part of POPSUGAR Select Home .
I've been seeing agate coasters everyone — gilded, plain, in all sorts of colors, but all expensive for a mere set of four (or even for just ONE !). I set out to find my own and ended up adding gold to their edges to create my own glam agate coaster set (of six) for less than $30!
To source the coasters, I searched for wholesale agate slices and found three- to four-inch non-drilled slices from Crystal River Gems  for just $4.25 each (for a set of six). The great thing about wholesale is that the more you buy, the lower the unit price of each slice is, so if you want to buy more for gifts or just to have extras, the unit price could be as low as $2. I picked blue coasters, but there were also red, pink, teal, black, and natural available.
The project itself is super easy — all you need are some coasters and gold nail polish (or a gilding kit and, in that case, just follow the directions that come with the kit). Make sure the nail polish you choose is a nice warm gold, as close as possible to the color of gold leaf, and avoid glittery polish. The nail polish we had is actually not very warm, so I may repaint these coasters at a later time. The sides of the coasters are very rough, so make sure to dab the polish and get it into all the cracks and crannies. The great thing about nail polish is that you can go back with nail polish remover and wipe away any extra polish that got onto the front or back of the coaster. It's very simple: just paint the edges, and enjoy your new gilded coasters!