Genuine & real baltic amber reflect UV light and this is commonly used to test real amber but the blue amber plays in a different category altogether. The yellow transparent amber stone will turn to opaque blue stone under the UV light making 2 stones in 1. If you love amber, you will be fascinated by blue amber that will change colour based on the intensity of the UV light, so in the summer sun be prepared to be amazed. There is only 2 known location in the world producing blue amber which is in Sumatra (Indonesia) & Dominican Republic. Prices are a lot higher than Baltic amber but we found some affordable pieces for you, the stock is very limited though.