| http://www.w3.org/ns/prov#value | - They pierced emeralds, and other gems, with all the deficacy of the present times, furnished with so many tools: and the direction of the hole is also very observables; in some it passes through the diameter; in others, only to the centre of the stone, and coming out at its circumference they formed triangles at a small distance from one another: and thus the figure of the stone to give it relief
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