Color Treasury of Gems and Jewels Author:Henri-Jean Schubnel (Translator) Uncut stones and Objects of Art.
Pgs 17 - 64 have 129 color plates with many pieces of art from the Louvre, The British Museum, museums in Germany, Italy, Istanbul, etc.
The first few pages give a historical introduction & classification of principal gems and gemstones.
Translated from French by Henri-Jean Schubnel.