Amber is a fossilized resin and has a long tradition of use in jewelry. Its most common color is a goldish yellow but it also comes in black, greenish, reddish, white, brown and blue and various blends. It can be found with natural entrapments of small animals and plants which can be amazingly well-preserved.
Amber is commonly used for inlays in metal jewelry or in plugs made of horn, bone or wood etc, but there are also massive amber plugs.
The material has a smooth surface that is kind to the skin, but tends to be a little fragile and can't handle heat very well, so it shouldn't be autoclaved. During winter, it will stay warm.