This is the seventh edition of a book which has been for years the 'bible' of professional and amateur gemmologists, as well as retail jewellers. Originally wri

This colorful book offers you a window into the world of Mahatma Gandhi, one of the most amazing people of the twentieth century. You will learn about Gandhi’

units have been included. References, which now number approximately 650, have been brought up to date. The most recently accepted values of the physical consta