There are 2 artists from the United Kingdom with this name.
1) Sapphire are an EDM duo from the UK consisting of Richard Simmonds and Stephen Jones who are also responsible for projects such as Ascension, Chakra, Lustral and The Space Brothers.
2) Sapphire is a talented child pop singer and vocalist who sings many cover songs along with some original songs as well. http://www.sapphireofficial.com/