Cally Oldershaw is a gemologist and science educator.
She is the author of several very widely held books about gems.
Oldershaw is Liaison Officer for the Geological Society of London and an examiner for the Gemmological Association of Great Britain.
[1] She also wrote the multiple parts of the Geological society of London series of booklets, Earth in our Hands,[5] and many parts of the Series: Closer look at... series for children published by Copper Beech Books.