BK Jewellers BK Malik
Some Gems
Some Gems
Topaz
is a silicate mineral of aluminium and fluorine with the chemical formula
Al2SiO4(F,OH)2. Topaz crystallizes in the orthorhombic system, and its
crystals are mostly prismatic terminated by pyramidal and other faces.
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Emerald
is a gemstone and a variety of the mineral beryl (Be3Al2(SiO3)6) colored
green by trace amounts of chromium and sometimes vanadium.[2] Beryl has a
hardness of 7.5–8 on the Mohs scale. Most emeralds are highly included, so
their toughness (resistance to breakage) is classified as generally poor.
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Amethyst
is a violet variety of quartz often used in jewelry. A reference to the
belief that the stone protected its owner from drunkenness. The ancient
Greeks wore amethyst and made drinking vessels decorated with it in the
belief that it would prevent intoxication. It is one of several forms of
quartz. Amethyst is a semiprecious stone and is the traditional birthstone
for February.
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Sapphire
which probably referred instead at the time to lapis lazuli) is a gemstone
variety of the mineral corundum, an aluminium oxide (α-Al2O3). Trace amounts
of elements such as iron, titanium, chromium, copper, or magnesium can give
corundum respectively blue, yellow, purple, orange, or green color. Chromium
impurities in corundum yield pink or red tint, the latter being called ruby.
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Quartz
is the second most abundant mineral in the Earth's continental crust, after
feldspar. It is made up of a continuous framework of SiO4 silicon–oxygen
tetrahedra, with each oxygen being shared between two tetrahedra, giving an
overall formula SiO2.
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Peridot
is gem-quality olivine. Olivine is a silicate mineral with formula of (Mg,
Fe)2SiO4. As peridot is the magnesium-rich variety (forsterite) the formula
approaches Mg2SiO4.
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"Beril"
and "Heliodor" redirect here. For the character in Tolkien's
legendarium, see House of Bëor. For the given names, see Beryl (given name)
or Heliodorus (given name). For the Sailor Moon villain, see Queen Beryl. For
other uses, see Beryl (disambiguation).
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A
ruby is a pink to blood-red colored gemstone, a variety of the mineral
corundum (aluminium oxide). The red color is caused mainly by the presence of
the element chromium. Its name comes from ruber, Latin for red. Other
varieties of gem-quality corundum are called sapphires. The ruby is
considered one of the four precious stones, together with the sapphire, the
emerald and the diamond.
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