larger than morillons, and called of the third colour or fort, are valued at from 50l. to 60l. per marc. Emeralds, called of the second fort, which are in larger and finer pieces than the preceding, are worth from 65l. to 75l. per marc. Lastly, those of the first colour, otherwise called negres cartes, are worth from 110l. to 115l.

Emeralds ready cut, or polished and not cut, being of good stone, and a fine colour, are worth,

| Carats | L. s. | |--------|------| | One | 0 10 | | Two | 1 7 | | Three | 2 5 | | Four | 3 10 | | Five | 4 10 | | Six | 7 10 | | Seven | 15 0 | | Eight | 19 0 | | Nine | 23 0 | | Ten | 33 0 |

To counterfeit EMERALDS: Take of natural crystal, four ounces; of red-lead, four ounces; verdigris, forty-eight grains; crocus martis, prepared with vinegar, eight grains: let the whole be finely pulverized and sifted; put this into a crucible, leaving one inch empty; lute it well, and put it into a potter's furnace, and let it stand there as long as they do their pots. When cold, break the crucible; and you will find a matter of a fine emerald colour, which, after it is cut and set in gold, will surpass in beauty an oriental emerald.