abstract |
A transparent substrate ( 10 ) made of a transparent material resistant to temperatures higher than 500° C., such as sapphire, includes recesses ( 13, 14 ) in at least one of its faces ( 11, 12 ) and/or a groove ( 15 ) machined into its thickness, that are covered with opaque, translucent or transparent enamel depositions ( 23 to 30 ) that may or may not be coloured, depending upon the pigments used in the enamel composition. |