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Alain.R.Truong
14 août 2015

Garnets

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All species of garnets possess similar physical properties and crystal forms, but differ in chemical composition. The species names are pyrope, almandine, spessartine, grossular, uvarovite and andradite.

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Malaia Garnet is one of the most beautiful gemstones in Africa, featuring orange to pinkish orange to red in color which do not match the color and gemological properties of any of the other more well known varieties of garnet. The only commercial deposits of Malaya occur in the Umba Valley in Kenya, in Northern Tanzania and in South Madagascar near Bekily.

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Spessartite is a rare form of garnet and often referred to as "Mandarin Garnet". The stone was introduced to the world about 200 years ago when it was discovered in in Spessart, Bavaria.

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When Andradite (garnet) is green, it is known as Demantoid but when it is brownish, or golden yellow it is referred to as Topazolite, like this untreated Topazolite round weighing 0.510 cts from Korkodino, Ural, Russia.

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Mandarin Garnet is the trade name for Fanta colored spessartites as pictured. The Fanta color is considered to be the finest color for spessartite and the designation is relatively new dating from the discovery of pure orange material in Namibia around 1993. After that, some fine stones were unearthed in Nigeria and later some were also discovered on the Kenya-Tanzania border although few were clean.

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Juicy candies - two glowing spessartite garnets. This beautiful color is due to manganese element, which produces an orange color. Spessartite garnet is ideochromatic, meaning it is colored by a fundamental element in its composition. 

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Spessartite garnet, also known as Mandarin garnet, is ideochromatic, meaning it is colored by a fundamental element in its composition. That element is manganese, which produces an orange color. Without the manganese, the stone would no longer be spessartite. Technically, spessartite was originally identified some 200 years ago in Spessart, Bavaria. 

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Exceptional Gem Rhodolite Garnet East Africa This color of garnet derives its name from rhododendron colored garnets first discovered in North Carolina in the late 1800s. Though the present gem is from more recent discoveries in Tanzania, rhodolite garnets also occur in India and Sri Lanka. The rich reddish purple hue of this cushion-shaped gem places it into the most desirable category of garnets. Both its transparency and luster are excellent. 

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Purple rhodolite garnet heart and rough. Rhodolite is a purplish red variety of garnet that has been used since ancient times. The name rhodolite is Greek, meaning rose stone. During the Middle Ages, garnet was regarded as a gem of faith, truth and constancy. Purple or purple-red is the most expensive and sought after color for rhodolite and large clean transparent stones are uncommon and valuable. 

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Helianthos Garnet, color change garnet from Tanzania, 4.3 carats. There are unique alluvial color change garnets coming from Tanga/Umba Region of Tanzania and this gem represents some of the best available. The color changes from pink with magenta/violet flashes indoors to a rich grape coloring in natural light. A dramatic stone. A literal translation of Helianthos means flower of the sun – an astounding gem strongly influenced by the very nature of light itself.

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Cognac color changing garnet from orangy yellow to medium light red-orange, origin is East Africa.

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Hessonite is a golden orange variety of grossular garnet and an important astrological gem in Vedic Astrology known as Gomedh. Also known as cinnamon stone or cinnamon garnet, is the most common variety of grossularite. The name comes from the Greek hesson, meaning inferior which is an allusion to the lower hardness and density compared to most other garnet species. 

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Often called the Rolls-Royce of greens at Cadillac prices, tsavorite a hundred times more rare than emerald. It is also cleaner, more brilliant and not oiled or treated in any way. Although Tsavorite is the name usually associated with the darker green garnet, there is no universally accepted standard that designates which shade of green qualifies a stone as tsavorite.

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Color Change Garnet is one of the most rare, interesting, and phenomenal of all gems. The color change can be intense and equal to the color change of top quality alexandrite. Color change garnets can easily be mistaken for alexandrite. Some of the best stones are from the deposit in Bekily, Southern Madagascar. Stones from this mine are well known for their strong alexandrite like color change.

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The family name Garnet comes from the Latin word "Garanatus", which means "seedlike" in reference to a pomegranate seed size and color. But to add more confusion, garnets usually called by their trade names that represent either very specific color, like Mandarin Garnet and Color Change Garnet, or place where garnet was discovered and mined, like Bohemian garnet, Tsavorite or Mozambique Garnet.

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Rhodolite tends to be lighter in color than most other kinds of red garnets and can be easily confused with rubies from Africa, because of the similarity in color. 

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Pyrope is a widely used gemstone with numerous alternative names and misnomers, had its peak popularity in 18th century when it was known as "Bohemian garnet". 

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Tsavorite is the name usually associated with the darker green garnets, but there is no universally accepted standard that designates which shade of green qualifies a gemmy garnet as Tsavorite. 

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Hessonite, also known as cinnamon stone or cinnamon garnet, is the most common variety of grossularite. The name comes from the Greek hesson, meaning inferior which is an allusion to the lower hardness and density compared to most other garnet species. 

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One of the rarer varieties within the garnet group, Mali Garnet typically yellowish green, brownish green, brown, or minty green. Mali name is based on the country where the stones are mined in West Africa. It was discovered in 1994 and Mali is still the only known source. 

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Malaia, sometimes Malaya, is name given to garnets orange to pinkish orange to red in color which do not match the color and gemological properties of any of the other more well known varieties of garnet. Indeed, the word malaia means "out of the family" or "outcast" in Swahili. 

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From a historical perspective, Demantoid is clearly the most important variety of the Andradite species. Demantoids from the Ural mountains of Russia were discovered in 1868. Possessing an unusual green color and a dispersion even greater than diamond, demantoid quickly became a treasured and expensive gemstone and was used by the famous Russian jeweler Faberge to create jewelry. 

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Color Change Garnet is one of the most rare, interesting, and phenomenal of all gems and the only example of blue garnet. In the past, gemological literature referred to garnet as occurring in every color but blue, but this is clearly not the case anymore and some Madagascan and Tanzanian color change garnets are indeed blue under the right light conditions. 

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Almandite, also known as Almandine or Oriental Garnet, is the most common, oldest and hardest of the red garnets.

 

 

 

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