The first section - 'The World of Gems' - contains information on gem formation, mining, crystal structure, and both the optical and physical properties of gems

An important feature of the book is a comprehensive visual identification key. This makes it easy for the reader to recognize the type of a stone, and so move o

The first generation of Christians were not popular. They were ridiculed, persecuted, yet according to Acts 17:6–7, they “turned the world upside down.” A

In its 114th year, Billboard remains the world's premier weekly music publication and a diverse digital, events, brand, content and data licensing platform. Bil

In its 114th year, Billboard remains the world's premier weekly music publication and a diverse digital, events, brand, content and data licensing platform. Bil