Precious metals are rare, naturally occurring metallic chemical elements. They tend to be less reactive than most elements, are usually ductile and have a high lustre. Precious metals have high economic value. Examples are: gold,silver and platinum. Gems on the other hand are minerals or rocks that can be cut, shaped, and polished into beautiful stones. Examples include emerald, ruby and sapphire.
Both precious metals and gems are rare and valuable.
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The figure is a rhombus.
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Biological mechanisms: Photosynthesis, digestion, cellular respiration.
Habitat for many species.
Participates in cycling of materials used by living things.
