Rare Blue Amber Natural Slab Cut Pendant. The term Blue Amber comes from the fact that when the amber is subjected to Ultra Violet Light from strong sunlight it will turn blue. This amber is 100% Genuine and is around 15 - 25 Million years old and is the resin from a Hymenaea protera tree. This section is around 7cm long, excluding the silver fitting. It has been fitted with a 925 silver suspention loop and we can suply a great quality long chain at extra cost of £20