
1) Individual diamond
Found on
https://www.crosswordclues.com/clue/regent-diamond

The Regent Diamond is a diamond owned by the French state and on display in the Louvre. In 1698, a slave found the 410 carat (82 g) uncut diamond in Kollur mine (more specifically in Guntur District, Andhra Pradesh, India) and hid it inside a large wound in his leg. An English sea captain stole the diamond from the slave and killed him and sold it...
Found on
http://en.wikipedia.org/wiki/Regent_Diamond

• A famous diamond of fine quality, which weighs about 137 carats and is among the state jewels of France. It is so called from the Duke of Orleans, Regent of France, to whom it was sold in 1717 by Pitt the English Governor of Madras (whence also called the Pitt diamond), who bought it of an Indian merchant in 1701.
Found on
http://thinkexist.com/dictionary/meaning/regent_diamond/

a brilliant-cut stone with a slight blue tinge that once was the outstanding gem of the French crown jewels; it was discovered in India in 1701 and ... [1 related articles]
Found on
http://www.britannica.com/eb/a-z/r/27
Re'gent di'a·mond A famous diamond of fine quality, which weighs about 137 carats and is among the state jewels of France. It is so called from the Duke of Orleans, Regent of France, to whom it was sold in 1717 by Pitt the English Governor of Madras (whence also called the
Pitt diamond ), who bought it of an Indian merchan...
Found on
http://www.encyclo.co.uk/webster/R/39
No exact match found.