Carat Fan Gauge
Science Photo Library
The Centenary Diamond
Patrick Landmann
Canadian Maple Leaf Gold Coin
Kaj R. Svensson/science Photo Library
Gold Ring In Acid
Martyn F. Chillmaid/science Photo Library
Diamond With Garnet Inclusion
Natural History Museum, London/science Photo Library
Diamonds
Jesper Klausen/science Photo Library
Diamonds Under Uv Light
Patrick Landmann
Black Opal Gemstone
Natural History Museum, London/science Photo Library
Diamond Grading Certificate
Patrick Landmann
Hope Chrysoberyl Gemstone
Natural History Museum, London/science Photo Library
Bubbles #14
Sakkmesterke/science Photo Library
Gold Hallmarks, 1897 #1
Sheila Terry
Topaz
Natural History Museum, London
Yellow Sapphire
Natural History Museum, London
Gold Hallmarks, 1897
Sheila Terry
Morganite
Natural History Museum, London
Gold Hallmarks, 1986
Sheila Terry