Description
Ancient Roman
jasper signet ring engraved with a grillos, 1st to 2nd century AD. A yellow gold ring set with one central oval jasper
intaglio of a 'grillos' or grasshopper in a
collet setting, the base of the collet encircled by twisted wire ornament, all on a flat ribbed
shank.
In Ancient Greece and Rome, the god Apollo was sometimes called “grasshopper” due to his role as the defender against plagues.
Ref: 15056
Ancient Roman jasper signet ring engraved with a grillos, 1st to 2nd century AD.
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OR
INTAGLIO
Material carved (worked) so that the design is cut into the surface of the material (incised). Opposite of cameo.
JASPER
An opaque, compact form of quartz which occurs in shades of dark red, brown, yellow, green and grey. Used especially for larger decorative pieces.
Shank
The part of the ring that encircles the finger, not including the top piece or head.
Collet
Very early method of setting gemstones. A collet is a thin, round band of metal that goes right the way around the stone.
CHALCEDONY Chalcedony is a form of quartz with a very special structure, known in gemmological circles as cryptocrystalline—meaning the crystal structure is incredibly small and dense, rendering it one of the smoothest gemstones. This allows for the material to be crisply carved, which makes it perfect for the jeweller type for which it is best known—cameos and intaglios.
Chalcedony also comes in a myriad of colours and patterns, and is often better known by these sub-types. One is onyx, a black form of chalcedony, often with white banding. Another is agate, which has fine layers of colour, and was thought by ancient peoples to quench thirst, and protect against fever. One of the most popular is sardonyx, characterized by wider, straight banding, which makes it perfect for use in cameo carving. Bloodstone is deep green colour with red splashes. Carnelian is the name for the reddish orange variety, while jasper is the name of chalcedony of any other colour or pattern.
