For the Gemstone as a mineral see Gemstone. A gemstone is a mineral, rock (as in lapis lazuli) or petrified material that when cut or faceted and polished is collectible or can be used in jewellery. ...
Gemstones is a album by Adam Green released in 2005. Adam Green (born 1981) is an American singer-songwriter best known for his group The Moldy Peaches, but began a solo career in 2002. ... 2005 is a common year starting on Saturday of the Gregorian calendar. ...
Some gemstones which may be generally considered precious or beautiful are too soft or too fragile to be used in jewelry (for example, single-crystal rhodochrosite) but are exhibited in museums and are sought by collectors.
Characteristics that make a stone beautiful or desirable are colour, unusual optical phenomena within the stone, an interesting inclusion such as a fossil, rarity, and sometimes the form of the natural crystal.
In current usage by gemologists, all gems are considered precious, although four of the five original "cardinal gems" (excluding the now-common amethyst) are usually—but not always—the most valuable.
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