Are they nuts

(Same as 1st two, but rerendered with more samples and slightly different post.)

Nut material node.

Material is way too simple, scratches should be used added to pointiness to reveal silver material, both materials would need another fresnell component and more.

Lightning as a combo between hdri and some random sun lamp is almost good enough (For interior where multiple lamps of different temperature are not uncommon), for exteriors learning how to use IBL sets seems crucial (annoyingly crashy workflow thought).

edit: More complex material node with some help from crazybump.

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