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2. Yogo sapphire - Wikipedia

   en.wikipedia.org/wiki/Yogo_sapphire

   The largest recorded Yogo rough, found in 1910, weighed 19 carats (3.8 g) and was cut into an 8-carat (1.6 g) gem. [26] The largest cut Yogo is 10.2-carat (2.04 g). [ 11 ] [ 27 ] [ 28 ] Because of the rarity of large rough Yogo sapphires, Yogo gem prices begin rising sharply when they are over 0.5 carats (0.10 g), and skyrocket when they are ...

3. List of U.S. state minerals, rocks, stones and gemstones

   en.wikipedia.org/wiki/List_of_U.S._state...

   A 2010 effort led by State Senator Gloria J. Romero, a Democrat from Los Angeles, sought to remove serpentine from its perch as the state's official stone. Organizations such as the Asbestos Disease Awareness Organization have supported the move as the olive green rock is a source of chrysotile , a form of asbestos that can cause mesothelioma ...

4. List of rubies by size - Wikipedia

   en.wikipedia.org/wiki/List_of_rubies_by_size

   Maharlika Star Ruby India: 10,820 carats (2,164 g) Philippines: Liberty Bell Ruby: Burma: 1976 [a] 8,500 carats (1,700 g) Stolen and still missing [2] Neelanjali Ruby: 1,370 carats (274 g) Prince of Burma: Burma: 1996 950 carats (190 g) Rosser Reeves Ruby: Sri Lanka: 138.7 carats (27.74 g) National Museum of Natural History [3] DeLong Star Ruby ...

5. Ruby - Wikipedia

   en.wikipedia.org/wiki/Ruby

   Ruby is a pinkish red to blood-red colored gemstone, a variety of the mineral corundum (aluminium oxide). Ruby is one of the most popular traditional jewelry gems and is very durable. Other varieties of gem-quality corundum are called sapphires. Ruby is one of the traditional cardinal gems, alongside amethyst, sapphire, emerald, and diamond. [3]

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7. Marble Cliff Quarry Co. - Wikipedia

   en.wikipedia.org/wiki/Marble_Cliff_Quarry_Co.

   The company grew through the expansion of stone grades from one to six and market-specific divisions that cater their products to specific industries, and at one point employed as many as 500 men. [ 4 ] [ 3 ] By 1928, Marble Cliff Quarry was producing 3 million tons of stone per year, and purchased land in Muskingum County to expand their ...