Jewel
In watch work, a stone having a hole pierced in it for the reception of a pivot. To Nicholas Facio, a native of Genoa, is attributed the invention of piercing stones for this purpose, early in the eighteenth century. See Facio.
How to true a balance, repair a chipped dial, temper a spring or test a stone — the working bench-book of the American watch trade, arranged A to Z.
In watch work, a stone having a hole pierced in it for the reception of a pivot. To Nicholas Facio, a native of Genoa, is attributed the invention of piercing stones for this purpose, early in the eighteenth century. See Facio.