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The first part of the Lapidarie.
Of Gemms in particular. Of diaphanous and whole transpa∣rent Gemms.
CHAP. I. Of the Diamond.
[Description of the stone.] THe true Diamond is a hard, diaphanous, perfectly transparent stone, which doth sparkle forth its glorie much like the twinckling of a glorious starre.
The true Diamond is the hardest of all other stones, without colour, like unto pure water transparent: and if it have any yellownesse or blacknesse, it is a fault in it. This property it hath, that it will snatch co∣lour and apply it and unite it to it self; and thus will it cast forth at a great distance its lively shining rayes, so that no other jewell can sparkle as it will. By this excellent emission of its rayes or beams, or by this generous sparkling forth of its glory, do the most judicious Jewellers distinguish the true Diamond, from those of bastard kinds.
THe tincture, foyl, or colour for a true Diamond is thus made: R. pure mastick and a small