Unlike the more known Baltic amber, Sumatran amber is completely natural. 
No treatment at all is given to the original rough material, except cut and polish.

Sumatran Amber is available in many shades among the following colors:
* transparent: honey, cognac, cherry, black 
* solid: white

A very special feature of Sumatran Amber is its natural fluorescence.
In many cases the flourescence is observable under normal light; it is of course much more intense under UV light.

Its formation is dated back to Miocene Age (10-20 Ma or older).