A method for cutting watch crystals along a plurality of contours in a plate of transparent material includes forming a first cut line or kerf to form a first chamfer for each of the crystals of the plate and marking at least one machined recess on a first side of the plate, turning the plate over and marking at least one of the position of the first chamfer and the position of the at least one machined recess, forming a second cut line or kerf to form a second chamfer for each of the crystals on a second side of the plate, and separating the crystals by machining through the plate at each of the contours to form edges of the crystals.

A method for cutting watch crystals along a plurality of contours in a plate of transparent material includes forming a first cut line or kerf to form a first chamfer for each of the crystals of the plate and marking at least one machined recess on a first side of the plate, turning the plate over and marking at least one of the position of the first chamfer and the position of the at least one machined recess, forming a second cut line or kerf to form a second chamfer for each of the crystals on a second side of the plate, and separating the crystals by machining through the plate at each of the contours to form edges of the crystals.

To reduce a width of a modified layer and suppress positional variation of the modified layer, a crystal orientation of a workpiece is measured, a vertical direction with respect to an A-plane of the measured crystal orientation of the workpiece is specified, and a polarization direction of laser light is adjusted so that scanning of laser light is performed along the specified vertical direction with respect to the A-plane of the crystal orientation of the workpiece.

A press for driving a crystal or a bezel into a watch case middle, including a support designed to hold the middle in position, and a bracket supporting a tool-holder to which a tool is attached, the tool-holder being movable in translation and cooperating with a handling member so as to slide relative to the bracket along an axis A-A when solicited by the handling member, the support including at least two jaws intended to cooperate with the middle so as to ensure that it is held in position, each jaw being movable in a plane P orthogonal to the axis A-A.

Watch glass (1) including a first element (2) made of a first material and a second element (3) made of a second material different from the first, more elastic than the first material, the second element (3) includes a skirt (3b) in its lower part, and the two elements (2, 3) are fixed to each other so that the first element (2) is oriented toward the exterior of a watch and the skirt of the second element (3) is adapted for the assembly of the watch glass (1) to a watch middle (4).

Watch glass (1) including a first element (2) made of a first material and a second element (3) made of a second material different from the first, more elastic than the first material, the second element (3) includes a skirt (3b) in its lower part, and the two elements (2, 3) are fixed to each other so that the first element (2) is oriented toward the exterior of a watch and the skirt of the second element (3) is adapted for the assembly of the watch glass (1) to a watch middle (4).

Method for cutting a watch crystal along a contour in a plate of transparent material, with the following steps: making, on a first side of the plate, a first cut line or kerf to form a first chamfer, for each crystal of the plate; turning the plate over and marking the position of the first chamfers or of a previously made machined marking; making, on a second side, a second cut line or kerf to form a second chamfer, for each crystal; separating the crystals by machining through the plate at each contour to form an edge of the crystal.

Method for cutting a watch crystal along a contour in a plate of transparent material, with the following steps: making, on a first side of the plate, a first cut line or kerf to form a first chamfer, for each crystal of the plate; turning the plate over and marking the position of the first chamfers or of a previously made machined marking; making, on a second side, a second cut line or kerf to form a second chamfer, for each crystal; separating the crystals by machining through the plate at each contour to form an edge of the crystal.

Watch glass (1) including a first element (2) made of a first material and a second element (3) made of a second material different from the first, more elastic than the first material, the second element (3) includes a skirt (3b) in its lower part, and the two elements (2, 3) are fixed to each other so that the first element (2) is oriented toward the exterior of a watch and the skirt of the second element (3) is adapted for the assembly of the watch glass (1) to a watch middle (4).

Watch glass (1) including a first element (2) made of a first material and a second element (3) made of a second material different from the first, more elastic than the first material, the second element (3) includes a skirt (3b) in its lower part, and the two elements (2, 3) are fixed to each other so that the first element (2) is oriented toward the exterior of a watch and the skirt of the second element (3) is adapted for the assembly of the watch glass (1) to a watch middle (4).