|Dimensions (mm)||not provided|
|Weight (carats)||not provided|
GEM TYPE: TOUCHSTONE BEAD, HOLE DRILLED FOR NECKLACE.
WEIGHT: 17.30 CARATS
SIZE: 24 X 13 X 10 MM
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
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.
My wife died a year ago and she loved emeralds this one is going on the box her ashes are in thank you so much for your services.
stars and gems Reply:
Aww such a lovely thing to do , thank you for sharing
|Starts||23rd Oct 2016 8:02pm PDT|
|Ends||27th Oct 2016 8:00pm PDT|
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