The Vishnu nicolo seal is a "finely engraved" oval agate seal (1.4 inches by 1.05 inch) from the Gandhara region, dated to the 4th century CE. Since 1892 it has been in the British Museum. Nicolo is an abbreviation of the Italian onicolo, meaning "little onyx", a type of stone with differently coloured layers into which the intaglio artist cuts to obtain an image in blue on black background.
The Vishnu nicolo seal is a "finely engraved" oval agate seal (1.4 inches by 1.05 inch) from the Gandhara region, dated to the 4th century CE. Since 1892 it has been in the British Museum. Nicolo is an abbreviation of the Italian onicolo, meaning "little onyx", a type of stone with differently coloured layers into which the intaglio artist cuts to obtain an image in blue on black background.
Source: Wikipedia "Vishnu nicolo seal" · CC BY-SA 4.0
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