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January 01, 2019
Garnet Gemstone is not a single mineral, is the name of a group which has a rich variety of color: red, orange, green, yellow, purple, pink, brown and even blue. Within of this group, we can find beautiful and affordable garnet stones and other more exclusive and expensive.
Garnet Gemstone is the name for a group of related mineral species. The group of garnets are formed by two isomorphic series (same structure but different composition).
The name is derived of the word “granum” or “granatum”, (pomegranate; for its resemblance to the seed of this fruit).
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Garnet Gemstone are available in a rich variety of beautiful and radiant colors, the most common is the red garnet; but we can also find greens, oranges, yellows, purples, pinks, browns and even blues.
Garnets can exhibit the Color Change phenomenon and asterism.
Transparent garnets can use any style of cut. The most common styles are standard shapes (oval, emerald, trillion, round, etc.) Translucent and opaque garnets are cut into cabochon, carvings and beads. Garnets with cat eye effect or asterism also are cut into cabochon.
Green Hydrogrossular ("Transvaal Jade") is cut into cabochon or imitating the jade pieces.
Garnets are available in large sizes, however Demantoid and Tsavorite are common small sizes, this two stones are the most expensive of all garnets.
Tsavorite garnets is cut trying to maximize the weight retention of the rough. Demantoid Garnets is often cut into round, brilliant and cushion shapes (which facilitates viewing of its FIRE).
Almandine, Pyrope, Rhodolite (red garnets) will show eye-visible inclusions unlike the Spessartine, Hessonite (orange garnets) which will show eye-clean inclusions .
Grossular is usually translucent.
Typical inclusions: Solid Inclusions, healed fracture, liquid inclusions, etc. Demantoid might have eye-visible inclusions called horsetails (chrysotile fibers). Hessonite garnet often has a turbulent inner appearance and is typically heavily included.
View our Inclusions Gallery - Beauty is Inside
Almandine: The most common of the garnets group of metamorphic origin. Main deposits in India (Rajasthan), Sri Lanka, Tanzania, Madagascar, Brazil, USA, etc.
Pirope: Is commonly associated to diamond mines and kimberlites. Russia, South Africa, Tanzania, Botswana, Australia, Sri Lanka. Brazil, Madagascar, etc.
Rhodolite: EEUU (North Carolina), Sri Lanka, India, Zimbabwe, Tanzania, Brazil, Kenya, Madagascar, Malawi.
Sperssatina: Pegmatites, igneous rock or metamorphic rock. Sri Lanka, Madagascar, Myanmar, Brazil, Namibia, Nigeria, Afghanistan, etc.
Grossular: Metamorphic rocks.
Hessonite: Sri Lanka, Brazil, Siberia, Canada, USA. Tsavorite: Tsavo Park, Kenya, Tanzania. Hidrogrossularia: Transvaal (North Africa), Canada, USA, China, Myanmar.
Andradite: Metamorphic rocks.
Demantoid: Russia, Zaire, Madagascar, Iran, Afghanistan, Italy. Topazolite: Italy, Kenya, USA, Romania. Melanite (volcanism): Italy (Vesuvius), France, USA, Brazil.
Uvarovite: Metamorphic rocks. Russia (Urals), USA (California), Canada, Finland, India.
The powers attributed to garnet are varied. To bring peace, prosperity, health, friendship, security.
Garnet is the Birthstone of January, the zodiacal stone of Aquarius and the gem that is usually gives for the second wedding anniversary.
More information about Birthstones.
Garnets are usually not enhanced.
Some Demantoid low temperature heat treated to improve color.
Imitations (Glass, YAG, GGG, etc)
Formula: X3 Y2 (SiO4)3X - Divalent cations = Ca2+, Mg2+, Fe2+ o Mn2+Y - Trivalent cations = Al3+, Fe3+ o Cr3+
Pyralspite garnets - aluminium in Y site
Ugrandite group - calcium in X site
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