leave the stone, change the mantle.

We're going to need to see the entire room and how it's styled.

Off the bat I'd say that particular mantel design doesn't even work w/the more modern stacked stone. They're two diff looks. limewashing that slate ledger stone would give you the same color as the surround, but that's about it.

that ledgerstone comes in this color. if you limewash it, it will look similar to this

But since the surround is the offending piece to this puzzle, I'd prob remove it. The heavy columns gives it a dated appearance. You could switch it out to something like the one above, and it would look better.

Or, you couldremove (the stone)

or cover it up and do something like this

no, please

Remove the mantle the stone is really pretty. The white stucco looking mantle with columns needs to come down. Floor to ceiling fireplace is so pretty! @Beth H. : has some really pretty suggestions if you do decide to lime wash --mantle need not be so bulky!!

Is it real or faux marble?

looks like a Cast Stone or a type of limestone.

Thanks for all the feedback! It’s a cast stone mantle.

Also, the decor style of the house is somewhat “modern farmhouse.” Macadamia walls, neutral color tile/ gray grout, kitchen blue, rustic art work with splashes of modern.

If the TV stays over the fireplace, remove all the stacked ledge stone.

That mantel has to go and then show us your space a question with no context can't be answered and IMO ledger stone was never a good idea on an interior surface and that TV is way to high .

When I was referring to a limewash, I imagined something like this where some colors of the ledger stone popped out rather than a fully white wall.

That is German Mortar Smear

I guess that’s the name for the “technique” but the product used is lime? There’s many instructional videos and webpages that show after you apply the lime wash, you can squirt it in spots to get that desired look. Anyway, does the concept sound like a good idea for that space?

Do you love the mantel? If your home is "modern farmhouse", the mantel is the issue, not the stacked stone...so if you love the mantel, try darkening (or replacing!) that instead of lightening the stone (plus, a whitish German Shmear on the stacked stone will leave your tv is looking like a big hole).

Can you take a picture from further back? Wondering what the hearth looks like...plus, as many have noted, we can't make decisions about the fireplace without seeing the rest of the room...

With German Mortar Smear, you use mixed mortar. It likely has some lime in it but it goes on in a different manner.

That mantel, surround and hearth are not modern farmhouse. if you don't want to remove & replace with something more consistent with modern farmhouse style, I agree that darkening it to blend in with the stone is a far better idea than lime-washing/schmearing the stone.