Note to Description of Precious Stones

I have read with great interest the passages of the manuscript relating to precious stones, and I have admired their conscientious appreciation and exactness in details.

A doubt was raised with respect to stones of combined colours; they do exist, but are by no means valued in Europe.

The proportions of the prices in regard to weights, are still very exact as to the Indian market, and uncut stones.

Experiments similar to those here described have been made in Europe, and chiefly in Germany, to heighten the colour of gems, rubies especially, by exposing them to fire, but their success has been so hazardous, nay costly, that speculation has been unwilling to expose itself to so much risk.

Jargon-corindon or circon was much used in the sixteenth century, and is now without value: it has the merit of possessing the hardness of the sapphire.

Henry Capt,
Jeweller.

17, Rue du Rhône, Geneva.