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Gemstones
Precious metals
Gemstones hardness
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Specific gravity is the ratio of the density of a substance to the density of a reference substance. The Specific gravity of a gemstone i...
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Hardness is defined as resistance to scratching; the hardness of a gemstone shows how well this gem resists abrasion (see Gemstones hardness...
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Precious metals are metals that are rare or difficult to obtain, these conditions beside of there special chemical characteristics make them...
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Cat's Eye describes a gemstone which has been cut and polished with a domed surface (cabochon), it shows a mobile streak of light that c...
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Gemstones hardness chart Gemstones´ family, Specific Gravity and Mohs hardness Gemstone Name Specific Gravity Mohs Hardness Gemstone Fa...
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Grossular or grossularite is the most varicolored of the garnet group. It is a calcium-aluminium mineral species of the Garnet. The name gro...
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Aquamarine Gemstone is a member of the beryl family. its name means "the blue water of the sea", Aqua means ‘water’ and marine m...
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Goshenite is the white to colorless variety of Beryl . It gets its name from Goshen , Massachusetts where it was first discovered. We can s...
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Platinum is considered as one of the most rare and precious metals. Its physical appearance is silver-white to gray.It is a transition metal...