Just testing the fracture branch with some sculpting for the detail, it seems to work - now I need to apply this to my stairs project.
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It’s beautiful! 
I love the tiny, bent nail in the top.
What are the colours? I thought you were using two wide emission planes for lighting but it also looks a little bit like a matcap.
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thanks Wevig,
The lighting is 1 sun and 1 area light . You can download the scene here: