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  2. 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]

  3. List of rubies by size - Wikipedia

    en.wikipedia.org/wiki/List_of_rubies_by_size

    A ruby is a pink to blood-red colored gemstone, a variety of the mineral corundum (aluminium oxide).Other varieties of gem-quality corundum are called sapphires.Ruby is one of the traditional cardinal gems, together with amethyst, sapphire, emerald, and diamond. [1]

  4. Ratnapura - Wikipedia

    en.wikipedia.org/wiki/Ratnapura

    Some traders go out of the city to buy gems. This includes neighboring towns like Kalawana, Bogawantalawa, and Ela-Hera. After the discovery of world-class alluvial sapphire deposits in the valley of Ilakaka in Madagascar, many Ratnapura merchants travel out of the country to Madagascar to buy gems. There are three main Gem marketplaces in ...

  5. Mining industry of Madagascar - Wikipedia

    en.wikipedia.org/wiki/Mining_industry_of_Madagascar

    The EITI believes this because of the significant portion of illegal exports of gold. Looking into the future, the Plan d'action Madagascar 2007-2012 predicts that the mining proportion of the GDP will increase to 30% as Madagascar shifts from a mainly artisanal and small-scale based mining industry to a large-scale public-private industry. [12]

  6. Geology of Madagascar - Wikipedia

    en.wikipedia.org/wiki/Geology_of_Madagascar

    Madagascar is the world's leading producer of many colored gemstones, including sapphires, rubies, multi-coloured tourmalines, emeralds, amethysts, cordierites, aquamarines and garnets. Madagascar is also a major source of graphite , making it the second-largest producer in Africa.

  7. Sapphire - Wikipedia

    en.wikipedia.org/wiki/Sapphire

    Madagascar is the world leader in sapphire production (as of 2007) specifically its deposits in and around the town of Ilakaka. [31] Prior to the opening of the Ilakaka mines, Australia was the largest producer of sapphires (such as in 1987). [32] In 1991 a new source of sapphires was discovered in Andranondambo, southern Madagascar.

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