Question

what is pietra-dura?​

Answer 1

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Pietra dura, (Italian: “hard stone”), in mosaic, any of several kinds of hard stone used in commesso mosaic work, an art that flourished in Florence particularly in the late 16th and 17th centuries and involved the fashioning of highly illusionistic pictures out of cut-to-shape pieces of coloured stone.

Answer 2

Explanation:

pistorical mosaic work using semi precious stones, typically for table tops and other furniture