Gemstone & Diamond Identification Laboratory https://gdilaboratory.com/ en-us Fri, 17 Apr 2026 10:20:05 +0530 PHP Simple XML https://gdilaboratory.com/page.php?id=21 https://gdilaboratory.com/page.php?id=21 Sapphireandnbsp;is a preciousandnbsp;gemstone, a variety of the mineralandnbsp;corundum, consisting ofandnbsp;aluminium oxideandnbsp;(andalpha;-Al2O3) with trace amounts of elements such asandnbsp;iron,andnbsp;titanium,andnbsp;chromium,andnbsp;copper, orandnbsp;magnesium. It is typically blue, but natural "fancy" sapphires also occur in yellow, purple, orange, and green colors; "parti sapphires" show two or more colors. The only color corundum stone that the term sapphire is not used for is red Mon, 29 Apr 2019 16:25:50 +05:30 https://gdilaboratory.com/page.php?id=20 https://gdilaboratory.com/page.php?id=20 Sapphireandnbsp;is a preciousandnbsp;gemstone, a variety of the mineralandnbsp;corundum, consisting ofandnbsp;aluminium oxideandnbsp;(andalpha;-Al2O3) with trace amounts of elements such asandnbsp;iron,andnbsp;titanium,andnbsp;chromium,andnbsp;copper, orandnbsp;magnesium. It is typically blue, but natural "fancy" sapphires also occur in yellow, purple, orange, and green colors; "parti sapphires" show two or more colors. The only color corundum stone that the term sapphire is not used for is red Mon, 29 Apr 2019 16:10:09 +05:30 https://gdilaboratory.com/page.php?id=19 https://gdilaboratory.com/page.php?id=19 Aandnbsp;rubyandnbsp;is a pink to blood-red coloredandnbsp;gemstone, a variety of theandnbsp;mineralandnbsp;corundumandnbsp;(aluminium oxide). Other varieties of gem-quality corundum are calledandnbsp;sapphires. Ruby is one of the traditionalandnbsp;cardinal gems, together withandnbsp;amethyst,andnbsp;sapphire,andnbsp;emerald, andandnbsp;diamond.andnbsp;The wordandnbsp;rubyandnbsp;comes fromandnbsp;ruber,andnbsp;Latinandnbsp;for red. The color of a ruby is due to the elementandnbsp;chromium. S Mon, 29 Apr 2019 16:10:03 +05:30 https://gdilaboratory.com/page.php?id=18 https://gdilaboratory.com/page.php?id=18 Diamondandnbsp;is aandnbsp;solid form of the element carbonandnbsp;with its atoms arranged in a crystal structure calledandnbsp;diamond cubic. Atandnbsp;room temperature and pressure, another solid form of carbon known asandnbsp;graphiteandnbsp;is theandnbsp;chemically stableandnbsp;form, but diamond almost never converts to it. Diamond has the highestandnbsp;hardnessandnbsp;andandnbsp;thermal conductivityandnbsp;of any natural material, properties that are utilized in major industrial applicat Wed, 03 Apr 2019 00:20:25 +05:30 https://gdilaboratory.com/page.php?id=17 https://gdilaboratory.com/page.php?id=17 Emeraldandnbsp;is aandnbsp;gemstoneandnbsp;and a variety of theandnbsp;mineralandnbsp;berylandnbsp;(Be3Al2(SiO3)6) coloredandnbsp;greenandnbsp;by trace amounts ofandnbsp;chromiumandnbsp;and sometimesandnbsp;vanadium.andnbsp;Beryl has aandnbsp;hardnessandnbsp;of 7.5andndash;8 on theandnbsp;Mohs scale.andnbsp;Most emeralds are highlyandnbsp;included,andnbsp;so their toughness (resistance to breakage) is classified as generally poor. Emerald is aandnbsp;cyclosilicate. Wed, 03 Apr 2019 00:19:49 +05:30 https://gdilaboratory.com/page.php?id=16 https://gdilaboratory.com/page.php?id=16 Opalandnbsp;is aandnbsp;hydratedandnbsp;amorphousandnbsp;form ofandnbsp;silicaandnbsp;(SiO2andmiddot;nH2O); its water content may range from 3 to 21% by weight, but is usually between 6 and 10%. Because of its amorphous character, it is classed as aandnbsp;mineraloid, unlike crystalline forms of silica, which are classed as minerals. It is deposited at a relatively low temperature and may occur in the fissures of almost any kind ofandnbsp;rock, being most commonly found withandnbsp;limonite,and Wed, 03 Apr 2019 00:18:57 +05:30 https://gdilaboratory.com/page.php?id=15 https://gdilaboratory.com/page.php?id=15 Topazandnbsp;is aandnbsp;silicate mineralandnbsp;ofandnbsp;aluminiumandnbsp;andandnbsp;fluorineandnbsp;with theandnbsp;chemical formulaandnbsp;Al2SiO4(F,andnbsp;OH)2. Topaz crystallizes in theandnbsp;orthorhombicandnbsp;system, and itsandnbsp;crystalsandnbsp;are mostly prismatic terminated by pyramidal and other faces. It is one of the hardest naturally occurring minerals (Mohsandnbsp;hardness of 8) and is the hardest of any silicate mineral. This hardness combined with its usual transparency a Wed, 03 Apr 2019 00:18:38 +05:30 https://gdilaboratory.com/page.php?id=14 https://gdilaboratory.com/page.php?id=14 Sapphireandnbsp;is a preciousandnbsp;gemstone, a variety of the mineralandnbsp;corundum, consisting ofandnbsp;aluminium oxideandnbsp;(andalpha;-Al2O3) with trace amounts of elements such asandnbsp;iron,andnbsp;titanium,andnbsp;chromium,andnbsp;copper, orandnbsp;magnesium. It is typically blue, but natural "fancy" sapphires also occur in yellow, purple, orange, and green colors; "parti sapphires" show two or more colors. The only color corundum stone that the term sapphire is not used for is red Wed, 03 Apr 2019 00:17:42 +05:30 https://gdilaboratory.com/page.php?id=13 https://gdilaboratory.com/page.php?id=13 Aandnbsp;rubyandnbsp;is a pink to blood-red coloredandnbsp;gemstone, a variety of theandnbsp;mineralandnbsp;corundumandnbsp;(aluminium oxide). Other varieties of gem-quality corundum are calledandnbsp;sapphires. Ruby is one of the traditionalandnbsp;cardinal gems, together withandnbsp;amethyst,andnbsp;sapphire,andnbsp;emerald, andandnbsp;diamond.andnbsp;The wordandnbsp;rubyandnbsp;comes fromandnbsp;ruber,andnbsp;Latinandnbsp;for red. The color of a ruby is due to the elementandnbsp;chromium. S Wed, 03 Apr 2019 00:15:08 +05:30 https://gdilaboratory.com/page.php?id=12 https://gdilaboratory.com/page.php?id=12 Rough gemstones areandnbsp;the rough pieces of mineral crystal which, in cut and polished form, is used to make jewelry or other adornments. However, certainandnbsp;areandnbsp;organic materials that are not minerals are also used for jewelry and are therefore often considered to be rough gemstones as well. Wed, 03 Apr 2019 00:04:53 +05:30