Amber is a beautiful material, ranging from from rich orange, brown and umber colours to a striking yellow-green. It is not actually a gemstone, but fossilized tree sap. This makes it very lightweight.
Not sure if your piece of amber is real or a clever fake? Try this test: Find a container large enough to submerge your amber in. Fill it with water, and put in as much salt as you can dissolve. Stir until the salt! crystals are completely dissolved. Then, place your piece of amber in the salt solution. If it floats, it’s real.