50 Million Year Old Amber Resin Fossil from Australia Gems and Gemstones: Amber is Fossilized Tree Resin Amber: Ultimate Guide To Collecting Amber (What It Is and How To Find Amber resin tree hi res stock photography and images Alamy Amber: Natural Organic Amber Gemstone & Jewelry Information; GemSelect Amber resin tree hi res stock photography and images Alamy. Twist Closure Length: 19" Width: 1 2" Amber is hardened tree resin from prehistoric forests 40 50 million years ago. Though its transparency and color varies, the most common colors are orange, yellow and brown. Amber can also range into milky whites and deep reds. Your piece was designed and set in sterling silver by Polish craftsmen. The amber carried at Green River Silver Co. comes from the Baltic region and is imported directly from Gdansk, Poland.