![]() ![]() The red color is caused mainly by the presence of the element chromium. 3-Ruby Cut ruby gemstone with inclusions Credit: HumanfeatherĬolor: Bright red, brownish-red, purplish-red, dark red Mohs hardness scale: 9 Mineral Class: Corundum Locality: Found mainly in Burma, Thailand, Sri Lanka and TanzaniaĪ ruby is a pink to blood-red colored gemstone, a variety of the mineral corundum (aluminium oxide). Most emeralds are highly included, so their toughness (resistance to breakage) is classified as generally poor. Beryl has a hardness of 7.5–8 on the Mohs scale. 2-Emerald Emerald with Calcite Muzo Mine, Boyaca Dept., Colombia Thumbnail, 2.9 x 1.4 x 1.2 cm “Courtesy of Rob Lavinsky, The Arkenstone, Color: Emerald Green to Dark Green Mohs hardness scale: 7.5 – 8 Mineral Class: Beryl Locality: Found in Columbia, Brazil, Zimbabwe, South Africa, Afghanistan, USAĮmerald is a gemstone and a variety of the mineral beryl (Be 3Al 2(SiO 3) 6) colored green by trace amounts of chromium and sometimes vanadium. Those properties determine the major industrial application of diamond in cutting and polishing tools and the scientific applications in diamond knives and diamond anvil cells. In particular, diamond has the highest hardness and thermal conductivity of any bulk material. Diamond is renowned as a material with superlative physical qualities, most of which originate from the strong covalent bonding between its atoms. Diamond is less stable than graphite, but the conversion rate from diamond to graphite is negligible at standard conditions. ![]() In mineralogy, diamond is a metastable allotrope of carbon, where the carbon atoms are arranged in a variation of the face-centered cubic crystal structure called a diamond lattice. Name Origin: From the Greek, adamas, meaning “invincible” or “hardest.” 1-Diamond Locality: Kimberley, Francis Baard District, Northern Cape Province, South Africa Dimensions: 7 mm x 6 mm x 6 mm “Courtesy of Rob Lavinsky, The Arkenstone, Chemical Formula: C Locality: Kimberly, republic of South Africa. Any accessory containing a precious stone would be deemed sophisticated and worn by someone of high class. Their rarity, beauty, and method in which they are produced all add to the allure of a precious stone. All precious stones are translucent and are valued by the richness of their color, except for the diamond, which has a higher value based on being colorless. Often used for jewelry and fashion accents, this term was created in the mid-1800’s to refer to four specific stones diamonds, rubies, emeralds, and sapphires. ![]() Precious stones are defined as visually appealing gemstones created from rocks or minerals. ![]()
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