That's a lovely heuchera. I don't know how common it is any longer, as it looks to possibly be an older variety.

You could try matching it up to pictures of 'Bronze Beauty'. The color of that one can vary quite a bit depending on the amount of sun it gets.

Wow, I think you may have it. How many heucheras do you have in your garden?

I'm ashamed to say it at this point...but since you asked...115 and counting.

That is awesome! I have lots of hosta and have just begun to become interested in Heucheras. They sure do come in some pretty colours. I have seen your pics and they are gorgeous.

I have lots of hosta as well. Heucheras (and company) are every bit as addicting. I find them even more dangerous than hostas for the simple fact that most will grow in both sun and shade, whereas hostas need mostly shade so I run out of places to plant them. That, and the heuchs are smaller than hostas so they're easy to tuck into all of the little nooks and crannies in my garden.

It could be Burnished Bronze

Here is a photo showing the colour under the leaf. Does that help to decide?

I have 'Burnished Bronze'. The tops and undersides of the leaves are much darker than the one you've pictured here. I don't think that's it.

My other thought is it could possibly be 'Palace Purple'. Is it situated in a lot of sun? Do you know what color the flowers are? Does it start out darker than it is in your picture, or is it always relatively the same color?

I am far from expert, but I'd also consider palace purple if it is a common one. Mine are in full sun, and they are quite bronze. This is their first full year in that location, and I had to double check my records to be sure they were PP because they looked so different!