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The property shared by all the gemstones such as diamonds, rubies, emeralds, sapphires, and topaz is extreme hardness.

Gemstones are precious, cut, and polished stones, which are used to make jewelry and adornments. gemstones are usually found in igneous rocks, such as diamond, topaz, and sapphires. However, in sedimentary and metamorphic rocks certain gemstones are also found. Igneous rocks are formed by the cooling of volcanic lava. The different composition of lava or magma produces a different type of stones, such as granite and gemstone.

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