Versatile horology component

A horology component for a timepiece, wherein the component consists of:

• a first portion,
• a second portion, and
• optionally a third portion arranged on top of or substantially even with the second portion or interposed between the first and second portion,
• the first portion comprising a part made from at least one opaque material at least partially superposed on top of the second portion,
• the second portion comprising a material capable of emitting at least one emission light wave if excited by at least one excitation light wave,
• the part of the first portion comprising a structuration allowing an emission light wave emitted by the second portion to be transmitted at least partially toward the outside of the horology component so that the horology component exhibits at least a first appearance by day and at least one different second appearance by night where the first portion is backlit by an emission light wave emitted by the second portion,
• wherein the structuration of the part of the first portion comprises openings with a diameter less than or equal to 60 μm and greater than or equal to 250 nm, and
• each opening is an open-ended substantially diametrically uniform cylinder or a substantially diametrically uniform cylinder that passes all the way through the first portion and has a constant depth.