Sri Lanka gem Jewellery


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Gem and Jewellery details

Alexandrite
Color:	color changes, from bluish green [daylight] to purple, red or brown [incandescent light]
Hardness:	8
Refractive Index:	1.74 – 1.77
Density:	3.68 – 3.80
Chemical Composition:	BeAl2O4
Crystal Structure:	orthorhombic
Origins:	Russia, Brazil, Tanzania, Madagascar, Zambia, Sri Lanka, Burma, India.

Amethyst
Color:	violet, purple-violet
Hardness:	7
Refractive Index:	1.54 – 1.55
Density:	2.65 – 2.66
Chemical Composition:	SiO2
Crystal Structure:	hexagonal
Origins:	Brazil, Uruguay, Bolivia, Argentina, USA, East Africa, Zambia, Namibia, Madagascar, India, Sri Lanka, Russia, Australia.

Aquamarine
Color:	blue to bluish green
Hardness:	7.5
Refractive Index:	1.57 – 1.59
Density:	2.67 – 2.75
Chemical Composition:	Be3Al2(SiO3)6
Crystal Structure:	hexagonal
Origins:	Brazil, Madagascar, Mozambique, Russia, India, Sri Lanka, China.

Chrysoberyl
Color:	blue, green, yellow, brown
Hardness:	8.5
Refractive Index:	1.74 – 1.77
Density:	3.68 – 3.80
Chemical Composition:	BeAl2O3
Crystal Structure:	orthorhombic
Origins:	Brazil, Madagascar, Zimbabwe, Russia, Sri Lanka, India, Burma.

Diopside
Color:	green, yellow-green, brown, blue, colorless
Hardness:	5.5 - 6
Refractive Index:	1.66 – 1.71
Density:	3.25 - 3.55
Chemical Composition:	CaMg(Si2O6)
Crystal Structure:	monoclinic
Origins:	USA, Brazyl, Austria, Italy, Tanzania, Pakistan, Russia, Sri Lanka, Burma.

Emerald
Color:	green
Hardness:	7.5 – 8
Refractive Index:	1.57 – 1.59
Density:	2.67 – 2.75
Chemical Composition:	Be3Al2(SiO3)6
Crystal Structure:	hexagonal
Origins:	Columbia, Zambia, Brazil, Madagascar, Russia, India, Pakistan.

Garnet color change
Color:	color change, from blue, green or greenish yellow to purple, red, brown or orange-yellow.
Hardness:	7
Refractive Index:	1.89
Density:	3.80
Chemical Composition:	nesosilicate
Crystal Structure:	isometric
Origins:	Madagascar

Garnet malaia
Color:	orangey yellow, reddish orange, brownish pink.
Hardness:	7 - 7.5
Refractive Index:	1.73 – 1.81
Density:	3.65 – 4.20
Chemical Composition:	[Mg3+Mn3]Al2(SiO4)
Crystal Structure:	isometric
Origins:	Madagascar, Tanzania.

Hessonite
Color:	yellow, orange, red, brown
Hardness:	7
Refractive Index:	1.72 – 1.75
Density:	3.65
Chemical Composition:	Ca3Al2(SIO4)3
Crystal Structure:	isometric
Origins:	Canada, Mexico, Brazil, Tanzania, Madagascar, Sri Lanka

Iolite
Color:	blue, violet-blue
Hardness:	7 - 7.5
Refractive Index:	1.52 – 1.56
Density:	2.53 – 2.78
Chemical Composition:	Mg2Al3(AlSi5O18)
Crystal Structure:	orthorhombic
Origins:	Brazil, USA, Canada, Madagascar, Sri Lanka, India, Burma.

Kornerupine
Color:	green, yellow-green, brown, blue-green
Hardness:	7
Refractive Index:	1.66 – 1.69
Density:	3.25 - 3.35
Chemical Composition:	(Mg,Fe)4(Al,Fe)6(SiO4,BO4)5(O,OH)2
Crystal Structure:	orthorhombic
Origins:	Greenland, Tanzania, Madagascar, Kenya, Sri Lanka, Burma, Australia.

Phenakite
Color:	colorless, light yellow, light pinkish or brownish
Hardness:	7.5 - 8
Refractive Index:	1.65 – 1.69
Density:	2.95
Chemical Composition:	Be2SiO4
Crystal Structure:	hexagonal
Origins:	USA, Brazyl, France, Switzerland, Tanzania, Madagascar, Russia, Sri Lanka.

Rhodolite
Color:	red, purple
Hardness:	7 - 7.5
Refractive Index:	1.73 – 1.77
Density:	3.60 – 3.94
Chemical Composition:	Al2(SiO4)3
Crystal Structure:	isometric
Origins:	Brazil, Tanzania, Zimbabwe, Madagascar, Sri Lanka, India.

Ruby
Color:	red, purple red
Hardness:	9
Refractive Index:	1.76 – 1.78
Density:	3.99 – 4.06
Chemical Composition:	Al2O3
Crystal Structure:	hexagonal
Origins:	Burma, Sri Lanka, Thailand, Cambodia, Vietnam, Madagascar, Tanzania, Kenya.

Sapphire
Color:	any color
Hardness:	9
Refractive Index:	1.76 – 1.78
Density:	3.99 – 4.00
Chemical Composition:	Al2O3
Crystal Structure:	Trigonal
Origins:	Burma, Sri Lanka, India, Madagascar, Kenya, Tanzania, Thailand, Cambodia, China, Australia.

Spessartite
Color:	orangey yellow, orange, red
Hardness:	7
Refractive Index:	1.79 – 1.81
Density:	4.14 – 4.20
Chemical Composition:	Mn3Al2(SiO4)3
Crystal Structure:	isometric
Origins:	USA, Germany, Brazil, Sri Lanka, Burma, Madagascar, Mozambique, Nigeria.

Spinel
Color:	red, orange, yellow, purple, blue, green, grey
Hardness:	8
Refractive Index:	1.71 – 1.92
Density:	3.99 – 4.00
Chemical Composition:	MgAl2O4
Crystal Structure:	isometric
Origins:	Brazil, USA, Madagascar, Sri Lanka, Burma, Thailand, Cambodia, Afghanistan, Russia.

Tanzanite
Color:	blue, violet blue, green, yellow, brownish
Hardness:	6.5 - 7
Refractive Index:	1.69 – 1.70
Density:	3.35
Chemical Composition:	Ca2Al3(O/OH/SiO4/Si2O7)
Crystal Structure:	orthorhombic
Origins:	Tanzania

Topaz
Color:	blue, yellow, pink, red, brown, green, colorless
Hardness:	8
Refractive Index:	1.60 – 1.64
Density:	3.50 – 3.58
Chemical Composition:	Al2[SiO4](F,OH)2
Crystal Structure:	orthorhombic
Origins:	Sri Lanka, Brazil, Madagascar, Russia, USA, Mexico, Pakistan.

Tourmaline
Color:	wide color range, green, blue, yellow, pink, red, brown, colorless. Bi-color is common.
Hardness:	7 - 7.5
Refractive Index:	1.61 – 1.66
Density:	3.01 – 3.25
Chemical Composition:	(NaLiCa)(Fe11MgMnAl)3Al6((OH)4(BO3)3Si6O18)
Crystal Structure:	trigonal
Origins:	Brazil, Madagascar, Namibia, Zambia, Sri Lanka, Burma, Russia, USA, Afghanistan.

Zircon
Color:	red, orange, purple, green, blue, yellow, brown
Hardness:	6 - 7.5
Refractive Index:	1.78 – 2.01
Density:	3.95 – 4.80
Chemical Composition:	ZnSiO4
Crystal Structure:	trigonal
Origins:	Tanzania, Kenya, Madagascar, Cambodia, Sri Lanka, Burma, Thailand, Vietnam, Australia.

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