Natural Baltic Amber Stone with Fossil Insect Inclusion Amber stone size: 53x25x7 mm. 7g. Completely natural amber and insect, 100% genuine. These fossil insects are all millions of years old! Baltic amber is considered the highest quality in the world. Insect Inclusions are rare. This Baltic Amber has been polished and is ready to display! Perfect gift for collectors or someone who admires authentic and rare nature creations. Baltic Amber is the hardened sap of certain types of ancient trees that have become fossilized over millennia. These intriguing Baltic Amber gems formed more than 45 million years ago. The insects inside are approximately the same age, having been captured while the amber was still a sticky tree sap.