A light transmissive member includes a substrate having a light transmission property, wherein on one surface of the substrate, an antireflection layer in which a low-refractive index layer composed mainly of silicon oxide (SiO.sub.2) and a high-refractive index layer composed mainly of silicon nitride (SiN) are alternately stacked is formed, and on the other surface of the substrate, an antistatic layer including at least a transparent electrically conductive film layer is formed.

A watch glass includes a first glass, second glass and a decorative element, in particular a gemstone. Here, the first glass and the second glass are connected to one another via a connecting intermediate layer. The first glass includes a continuous recess. The decorative element includes a base region, which is arranged settingless in the recess of the first glass and in direct contact with the connecting intermediate layer. Further, a watch can include such a watch glass.

An optical component includes a base material and a film containing silica particles and conductive transparent metal oxide particles. The conductive transparent metal oxide particles are preferably composed of SnO.sub.2. The number-based average particle diameter of the conductive transparent metal oxide particles is preferably 0.8 nm or more and 5.0 nm or less. When the content of the silica particles in the film is represented by Xs (vol %) and the content of the conductive transparent metal oxide particles in the film is represented by Xc (vol %), it is preferred to satisfy the following relationship: 0.003Xc/Xs0.12.

An optical component includes a base material and an antireflection film containing silica particles, wherein the porosity of the antireflection film is 15% by volume or more and 36% by volume or less. The number-based average particle diameter of the silica particles is preferably 0.5 nm or more and 4.0 nm or less. The antireflection film is preferably formed by using a composition containing the silica particles and a dispersion medium for dispersing the silica particles. The thickness of the antireflection film is preferably 50 nm or more and 120 nm or less.

A watch including a gasket (18) arranged at the periphery of the glass (14), an intermediate portion (20) laterally surrounding the analogue display and defining a radial surface forming an axial stop for the glass, a solar cell (30) extending at least mostly between the lower level of the dial and the glass and being arranged behind the intermediate portion, which is formed at least partially by a translucent or transparent material and configured to make it possible for the incident light to propagate in the intermediate portion and to subsequently reach the solar cell. The gasket is also formed at least mostly by a translucent or transparent material and it forms with the intermediate portion axially a continuous medium. In variants, the gasket is arranged axially adjacent to the intermediate portion or it is axially separated from the intermediate portion by a translucent or transparent intermediate medium.

A horology or jewellery component, characterised in that it contains phase silicon nitride in a percentage by volume comprised between 99% and 100%.

A watch glass includes a first glass, a second glass and a decorative element. The second glass is connected to the first glass via a connecting intermediate layer. The decorative element is inserted in a setting, which is arranged in a watch glass recess. The watch glass recess is formed by a first recess in the first glass and a second recess in the second glass. Here, a space of the watch glass recess is defined by the first glass, the second glass and the setting. The space is filled with connecting material of the connecting intermediate layer, so that the setting is connected via the connecting material to the first class and the second glass.