The oldest discovered Baltic amber dating back to about 320 million years. Its chemical composition is different from that which we are commonly used to see. However, it is usually formed from the resin of flowering plants.
We have the usual amber formed at the Jurassic Period (the period of dinosaur age) for about 180 million years ago. We find insects in the amber of the subsequent period (150 million years old).
The Baltic amber or Succinite is found in deposits of the former Semba River. These deposits known as the Blue Earth layers (the largest found in region of Kaliningrad, Russian Federation).
Baltic amber is 40 to 50 million years formation of a coniferous resin. The former continent was covered with great forests. Rivers washed out the accumulated resin from forest soil, because of the extreme worming of climate, and transported to the sea. The fallen former tree resin was transparent, pale yellow in color. Over the time, and the oxidation processes of resin was transformed to amber, but the color remained (transparent amber). The change in color influenced by the process of the pitch change took place inside the individual piece formation.
During the process of oxidation, the color may darken, gained depth (deep yellow, red, dark red color). The color tone from yellow to white in full on the same piece of the amber is the consequence of the evaporation process of the volatile components of resin. The impurities trapped in the resin affected the color (blue, brown, black, green). Variety of the amber color can be also gained by changes in its main structural elements; the evaporation of different gasses is the result of a very small gas bubble formation located in a certain density and form. They are fragmenting the light, which we see as one or another color.