AMBER is an organic gem, formed from the hardened sap or resin of ancient pine trees. The name probably derives from anbar, an Arabic word describing ambergris. Amber has been collected and treasured since very early times, and has been much in demand from pre-Egyptian times to the present, because of its lightness (it will float in very salty water) and its wonderful golden or yellow colours. Some rare amber pieces have inclusions of small plants or animals, making them both valuable and historically interesting.