A method of setting stones into a grooved channel or outlined space, so that they lay flush with the surface of the metal.
Intaglio refers to a form of image making in which the image is produced by incising into the printing plate, thus producing a negative image. Intaglio is the opposite of cameo.
It is used in making engraved seals, where it leaves a raised design on the material being stamped, especially wax. It is also used in some pendants and signet rings.
and where it is the incised line or area that holds the ink.
An iridescent object displays many lustrous, changing colours. Iridescence is caused by the reflection of light from the jewel.