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ALTHOUGH this be an important Secret, and ill People may commit Cheats by it, yet I will here give it, for the sake of the Curious, who only seek for their own Satisfaction.
Take one Pound of Load-stone, a Pound of Quick-Lime, and half a Pound of common Sulphur, the whole reduced to powder, and well mixed. With this powder cement your Crystals and Diamonds of Alanson well cut, in a Crucible covered and luted well: Being dry, set it in a Glass-house Furnace three Days, in a place where the Matters may be continu∣ally red hot without Fusion, if you have not a Fur∣nace ready at hand for that purpose; and take care not to take out the Crucible all at once, but let it cool gently, otherwise the Stones might break. Having broken the Crucible, you'll find your Stones very fine, and shining, and which will resemble Diamonds of the Old Rock, which repolish at the Wheel to give it colour, then work it; and they can scarce be distinguished from fine ones.