TOUCH STONE BEAD 17.10 CARATS 0355-8

Item Information

Dimensions (mm) not provided
Weight (carats) not provided
Colors

DESCRIPTION:


GEM TYPE: TOUCHSTONE BEAD, HOLE DRILLED FOR NECKLACE.

WEIGHT: 17.10 CARATS

SIZE: 24 X 13 X 10 MM

COLOUR:  BLACK

CLARITY: OPAQUE

1 PIECE

 

ADDITIONAL COMMENT:

A TOUCHSTONE IS A SMALL TABLET OF DARK STONE SUCH AS FIELDSTONE, SLATE OR LYDITE, USED FOR

ASSAYING PRECIOUS METAL ALLOYS. IT HAS A FINELY GRAINED SURFACE ON WHICH SOFT METALS LEAVE A

VISIBLE TRACE.

DRAWING A LINE WITH THE GOLD ON THE TOUCHSTONE WILL LEAVE A VISIBLE TRACE. THE TRACE WILL

REACT DIFFERENTLY TO SPECIFIC CONCENTRATION OF NITRIC ACID, THEREBY IDENTIFYING THE QUALITY

OF THE GOLD. THUS 18 CT PURITY IS NOT AFFECTED BUT 14 CT GOLD WILL SHOW CHEMICAL ACTIVITY.

 

4d 16h 8m 40s

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Pricing & Details

Bid Increment $1.00
Starting Bid $34.00
Auction ID 161240
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Viewed 551 times
Starts 8th Dec 2016 7:02pm PST
Ends 14th Dec 2016 7:00pm PST

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