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Lead white and copal yields a mix that can be controlled between very stiff to "ropey" like warm mozzarella. "Sculpting" this kind of detail as a built-up area, then glazing dark tones into it when dry is one approach that will yield a more convincing "3-D" effect than sgraffito (scratching lights out of a dark over-painting).
Take a look at Rembrandt's "Saskia as Bellona" and "Man in Armor" for his handling of detail encrustations on the armor.
A matter of taste, and certainly of the patience and skill of the painter to "embroider" jewelry in full detail, but I'd think it better to imply the detail in careful accent than to rebuild the piece with paint!
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