The following free information is from website: http://en.wikipedia.org/wiki/Amber
Amber (or, technically, resinite) is fossilized tree resin (not sap), which has been appreciated for its color and natural beauty since Neolithic times. Good quality amber is used for the manufacture of ornamental objects and jewelry. There are five classes of amber, defined on the basis of their chemical constituents.
Because it originates as a soft, sticky tree resin, amber sometimes includes animal and plant material as inclusions
The hardness (Mohs scale) : 1-3
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Amber with the natural insect inclusion is more expensive than the amber with no insect; he price is also depend on the beauty and complete shape of the insect.
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