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Gem: A gem is an item that is organic or non-organic and possesses rarity. The intrinsic value is based on quality, beauty, size, durability as well as rarity. Synthetics, glass, plastic and other imitations do not qualify as gems.
The thermal conductivity of amber is low, so it feels warmer to the touch than non-organic gem materials.
If touched by a hot needle, amber releases a sweet, resinous odor. In contrast, plastic substitutes have an acrid odor.
 See also: Specific gravity, Organic, Salt, Crystal, Needle
  
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