- Semi-precious stoneA gemstone (also called a gem, fine gem, jewel, precious stone, or semi-precious stone) is a piece of mineral crystal which, in cut and polished form, is used to make jewelry or other adornments. However, certain rocks (such as lapis lazuli and opal) and occasionally organic materials that are not minerals (such as amber, jet, and pearl) are also used for jewelry and are therefore often considered to be gemstones as well. Most gemstones are hard, but some soft minerals are used in jewelry because of their lusteror oth…Leaders of states in the U.S. which have significant mineral deposits often create a state mineral, rock, stone or gemstone to promote interest in their natural resources, history, tourism, etc. Not every state has an official state mineral, rock, stone and/or gemstone, however."Time Considered as a Helix of Stones" is a science fiction short story by American writer Samuel R. Delany, published in the December 1968 issue of New Worlds. It won the Hugo Award for Best Short Story 1970, and the Nebula Award for Best Novelette in 1969.
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