Ruby and Sapphire cut stones
Ruby and sapphire cut stones viewed through their crowns. Colours are due to trace metallic impurities. Ruby and sapphire are both varieties of the mineral corundum (aluminium oxide)
Picture No
10703709
Media ID
47586223
Size
1887px x 1525px
(1.5MB)
Credit
Mary Evans / Natural History Museum
Source
Photograph from the Natural History Museum Collection
