Intaglios: A gem carved in negative relief.
Iridescence: This is the rainbow like color effect seen in some gems and is caused by cracks or structural layers breaking up light into spectral colors.
Intaglios
This art conception is quite similar to that of cameos. It is carved on gemstones and seashells as well. The difference between the two is of carved portraits.
Intaglios and Cameos originated in ancient Greece where glyptography was perfected to an art form.
Cameos and intaglios are similar in that both usually are carved portraits in stone or seashells. They differ in that cameos are raised portraits, while intaglios are carved down into the surface of the material.
As a jewelry stone, it is either carved (intaglios), polished en cabochon, or fashioned into beads, bracelets or rings.
The quality of the jade is taken into account when fashioning.
" The ancient Greeks and Romans used onyx for cameos and intaglios, and in India, onyx was worn for protecting against the evil eye and also for cooling ardor (it was believed that onyx provoked discord and separated lovers).
Frequently Garnets were carved into cameos and intaglios and worn in rings. Carbuncle is an old term which typically referred to a Cabochon Garnet. The back of the Cab was hollowed out to create a brighter Garnet and make it more transparent.
hematite - An opaque mineral; yielding pigments when red and earthy; fashioned as intaglios and other carved gems when dark gray to black with metallic luster. The latter variety is translucent and red in very thin sections.
THE Amethyst reference: Intaglios, engraved gems, Greeks, Romans, Renaissance
Short Amethyst Overview
Classic Amethyst Localities
Amethyst locations in Spain , Siberia and Brazil (1871)
Bohemian Amethyst (1865) ...
The stone has its use in intaglios and cameos. It is actually silicon dioxide with the specific gravity ranges in between 2.65 to 2.66. The hardness of this stone is seven on Mohs scale and the refractive index varies in between 1.543 to 1.552.
To create intricately carved cabochons, cameos, and intaglios (photo above) out of sapphire, early Roman engravers may have used 'adamas' (diamond) fragments as carving tools, given that they are the only material that is harder than corundum.
Some of the most common intaglios were carved in the gemstone Carnelian and used for signet rings. The earliest known signet rings date back to ancient Egypt.
Iridescent ...
Hardstone: The term used for any opaque stones used in making cameos, intaglios, or mosaics, such as agate, carnelian, onyx, etc.
Head: The prongs that secure a stone onto a setting.
Hematite
Hematite is a metallic appearing dark gray material that is cut into beads, cameos, intaglios and cabochons. It is actually an iron ore. It is quite heavy. Most hematite will be in the very affordable range.
A heavy, metallic gray to black gemstone used in beads and often in intaglios
Inclusions
Natural particles or foreign matter which is enclosed with-in a gemstone ...
An all encompassing term used for stone or gemstones used in making intaglios, cameos, or mosaics. This group includes agate, onyx, and carnelian.
Harlequin Pearls ...
Treasured by the Romans, opals were held in high esteem and worn by the wealthy in the form of rings and intaglios as a symbol of love, hope and purity. The Arabs believed that the opals fell from the sky during lightening storms.
The Victorians, too, prized chalcedony for carved cameos and intaglios: its fine texture allows for delicate and intricate workmanship.
A form of Quartz, the Romans prized them as seals, and the Victorians carved them into an endless array of cameos and intaglios. To this day, the elegant appeal of black Onyx makes it the choice of those who prefer basic black.
Onyx
Onyx is a chalcedony that consists of parallel bands of white and black. It is a semi-precious gemstone and is commonly used in cameos and intaglios.
It is opaque and generally dark grey (almost black) in colour. It is cut en cabochon or as beads, though in Germany it is also used for intaglios. It is similar to steel in appearance, but much darker.
1) Intaglio: In these gems, a design is cut into the gem, so that it lies below the rest of the gem's surface. Historically they were worn in a ring which was also used to form a signature seal. Intaglios have always been most popular in men's ...
Shown at right are 2 intaglios called "Boy Schooling a Horse". The Classical intaglio on the left is the original, dating to 3,000 BC, and is now in the British Museum.
Onyx is not always black, but black onyx is the most popular in jewelry. Onyx also exists in white, tan, and brown. It is usually cut in the shape of a cabochon and sometimes found in the form of beads. Also commonly used for intaglios and cameos.
breastplate of Aaron, High Priest of the Hebrews in the Old Testament, was believed to actually be peridot. Ancient Egyptians, around 1580 B.C. to 1350 B.C., created beads from peridot. For Greek and Romans, peridot was in popular use as intaglios, ...
It ranges from black, black-gray, to brown red and is bright red when cut into thin plates. It's a 5 1/2-6 1/2 on the Mohs' scale and was used as mourning jewelry in earlier times. Popular for intaglios (engravings).
An ornamental stone found mainly in Greece or in Asia Minor. Carnelian has a translucent color which may be deep red, flesh red, or reddish-white. It takes a good polish and cut, and is ideal for seals and intaglios.
Once seals fell out of use, the intaglio tended to face out to the viewer rather than down as on a seal. Some of the most commonly found Victorian intaglios are carved in Carnelian, an orange-brown variety of quartz.
Ancient Greeks and Romans called it sardius and used the gemstone for signet rings, cameos and intaglios, while Tibetans created amulets of silver with generous applications of carnelian.
Some of the most commonly found Victorian intaglios are carved in Carnelian, an orange-brown variety of quartz. IntaglioCarving into a stone to make a hollowed out image.
 See also: Intaglio, Gemstone, Color, Jewel, Cameo
  
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