I happened on one of these unique pieces last evening in London at the Selfridges Hermes. I had to make a rush decision whether to purchase it, as they were closing for the night. I did purchase the pendant, shown here:
https://www.hermes.com/us/en/product/isthme-touareg-pendant-H052775FP00/
I've searched tPF Hermes threads under shopping, and I see very few posts of this item or related pieces in this collection. I was surprised to see it in the jewelry case, as I thought these were gone about a year ago.
I'd be interested in hearing more details about the artisans who created these pieces and the method they use to do so.