Amber is made of yellow transparent fossil resin with insect inclusions Amber, Fossilized Tree Resin Pieces in Orange Color Stock Photo Image amber, fossilized tree resin isolated with shadow on white background Amber resin tree hi res stock photography and images Alamy. Metal: Sterling Silver Length: 2" Width: 3 4" 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.