One trick of the trade for determining when need any slate roof repairs can be always to check the attic for Mosaic Tile dust. Yes, attics are covered with all manner of tiny food crumbs. For this test you should really determine if what happen to be seeing is slate (rock) dust.
But it's totally use manufactured stone veneer without those challenges. The manufactured veneer weighs costs much less than diamond. Using it on a fireplace shouldn't require any structural changes whatsoever. And it's non-combustible, just like real Stone veneer for DIY home improvement, so it's perfectly safe to use, too. You also don't call for a concrete base or backing to use manufactured stone veneer inside or patio. It can be installed on almost any surface. That cuts within the weight along with the prep time, so installation takes a shorter time and costs less, really.
Rings are used in wood burning applications.