IMO, the frames are the charcoal grey and gunmetal on the right in your pic, with the original grey/grape lenses taken out and custom lenses put in.
View attachment 1042090
You could try putting the brown lenses into the grey frames to see how they look.
In the higher res. pic above, the custom lenses appear to be much lighter in a "solid" even color and not so much a "gradient" brown, as your pic seems to show.
There's always big variations in eyewear product images on websites compared to the "real thing" actually in your hand, which I always feel is slightly misleading on their part.
I would prefer them to use "real" pictures of eyewear, exactly like the pic uploads on this thread!