I hope most of my readers realise that amber is not really "made" as such. It has been around for hundreds of millions of years and is a product of a long process.
Amber is fossilized tree resin (not sap). Hundreds of millions of years ago huge coniferous forests covered big parts of what is today Baltic sea and its environs. Resin from these trees (in our region its Pinus succinifera and similar trees) seeped down sometimes trapping insects or other organic matter (this way forming so called inclusions) and then solidified. Geological changes caused parts of the forest to be buried under the ground or later even water and the process began.

Small raw amber nuggets