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Gemstone Chart (A Searchable Collection of Precious/Semi-precious Stone Information)

This is a searchable collection of  international precious stone/gem. With its sparkle and color, a gem can mystify and intrigue people.  Most gemstone buyers purchase gems  for making jewelry.  But some buyers are gemstone collectors. The chart is  resource for your gemstone buying and collecting.
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Gemstone Chart
Natural Andradite Natural Andradite
Andradite is a Garnet, belonging to the Garnet group. It has the most powerful luster of any garnet, and this makes it a reputable gem.
Color: brown, greenish brown, yellowish green, green
Categories: semi-precious stone
Chemical Composition: Ca3Fe2(SiO4)3
Crystal Group: Cubic
Refractive Index: 3.82 C 3.85
Hardness: 6.5
Density: 1.888 C 1.889
Occurrence: Mexico, Korea, Namibia, Russia, Iran, South Africa

Natural Color Change Garnet Natural Color Change Garnet
Color Change Garnet is one of the most rare, interesting, and phenomenal of all gems.Color Change Garnet gem stone rough from Madagascar Gems is fine quality.
Color: Color changing from green or lavender to red.
Categories: semi-precious stone
Crystal Group: Cubic
Refractive Index: Nesosilicate
Hardness: 7-7.5
Density: 3.8
Occurrence: East Africa, Madagascar, Sri Lanka

Natural Grossularite Natural Grossularite
A member of the garnet group, grossularite is found in a variety of colors including, yellow, brown, white, colorless, green, violet-red, and orangey red.
Color: Brown, yellow, green
Categories: semi-precious stone
Chemical Composition: Ca3Al2(SiO4)3
Crystal Group: Cubic
Refractive Index: 1.72-1.748
Hardness: 7.25
Density: 3.65
Occurrence: Canada, East Africa, Pakistan, New Zealand, Ceylon, South Africa, U.S.A.

Natural Hessonite Natural Hessonite
Hessonite is one of the gem varieties of the garnet mineral, grossular. Hessonite is usually cinnamon brown and has been called "cinnamon stone". Hessonite can also be orange; this color is becoming common on the gem markets.
Color: Brownish-orange, brownish yellow, aurora red
Categories: semi-precious stone
Chemical Composition: Ca3Al2(SIO4)3
Crystal Group: Cubic
Refractive Index: 1.72-1.74
Hardness: 7.25
Density: 3.65
Occurrence: Sri Lanka, Mexico, Brazil, Canada, Madagascar

Natural Malaia Garnet Natural Malaia Garnet
Malaia garnet is a mixture of almandine, pyrope, and spessartine. It has remained the preserve of collectors for the 2 decades since it was discovered, mainly due to its extreme rarity.Tanzania is the known source for this lovely gemstone.
Color: orangey pink, champagne, orange brown, copper-pink.
Categories: semi-precious stone
Chemical Composition: [Mg3 + Mn3]AL2(SIO4)
Crystal Group: Cubic
Refractive Index: 1.73 - 1.81
Hardness: 7 - 7.5
Density: 3.65 - 4.20
Occurrence: Kenya, Tanzania, Madagascar

Natural Mali GarnetNatural Mali Garnet
Mali Garnet is a mixture of grossular (calcium aluminum silicate) and andradite (calcium iron silicate ). It is a yellow-green variety of grossular with a slight overlap in the grossular-andradite series.Mali garnet is one of the latest discoveries in the garnet family.
Color: yellow, brown, green.
Categories: semi-precious stone
Chemical Composition: Ca3Al2(SiO4)3
Crystal Group: Cubic
Refractive Index: 1.72-1.748
Hardness: 7.25
Density: 3.65
Occurrence: Mali

Natural Rhodolite Natural Rhodolite
Rhodolite is a beautiful pink to violetish red garnet which was named after the rhododendron flower. Commercially rhodolite is one of the most important garnets. Rhodolite is quite available in small sizes which are relatively low in price. Very fine large rhodolite garnets are rare and are moderate in price.
Color: red, purple-red
Categories: semi-precious stone
Chemical Composition: Al2(SiO4)3
Crystal Group: Cubic
Refractive Index: 1.75 - 1.77
Hardness: 7.25
Density: 3.74 - 3.94
Occurrence: Brazil, East Africa, Ceylon, India, Madagascar, Zimbabwe

Natural Spessartite Natural Spessartite
The Spessartite is one of the most popular of all garnets. It is highly desired by collectors, jewelry designers and gem lovers.The sources for gem quality spessartine are Sri Lanka and Brazil.
Color: Orange, yellow, brown
Categories: semi-precious stone
Chemical Composition: Mn3Al2(SiO4)3
Crystal Group: Cubic
Refractive Index: 1.79-1.81
Hardness: 7.25
Density: 4.14-4.20
Occurrence: Germany, Ceylon, Burma, Nigeria, Maevatanana-Madagascar, Isoanala-Madagascar, East Africa.

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