80 Bert Muppet Photos & High Res Pictures Getty Images Bert Muppety Wiki Fandom Sesam Street Bert Wiki Muppets: Beto in english BERT. Metal: Sterling Silver Backing: Lever Back Length: 1 3 4" 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.