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Sigma KEE - Gemstone
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寶石
Gemstone is the subclass of Mineral items that are especially valued for use in jewelry and other decorative items, and also in some mechanical and industrial applications.
Relationships      
Parents Mixture A Mixture is two or more PureSubstances, combined in varying proportions - each retaining its own specific properties. The components of a Mixture can be separated by physical means, i.e. without the making and breaking of chemical bonds. Examples: Air, table salt thoroughly dissolved in water, milk, wood, and concrete.
Children 珍貴的寶石PreciousGemstone is the class of Minerals and fossilized substances that have great monetary value.
 半寶石SemipreciousGemstone is the class of Minerals and other substances that have significant monetary value, but less than those of the class PreciousGemstone.


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