Amber Jewelry Need Help ID

I bought out a large tote of jewelry and found a few very nice pieces,this lot is a very long necklace 2 bracelets and a large pendants,the bracelets are cold to the touch as well as the pendant,pendant has a chip on the bottom look like granulated glass inside but not glass,has some inclusion inside,the necklace has several different colors,I would love to know if this lot or pendant bracelets are amber.How can I test for amber.