Yellow gold :
Yellow 18K gold is an alloy contianing 75% of pure gold, whereas 14K gold contains only 58,5% of pure gold.
Old cut :
Refers to a cut not following the cutting rules described by "Marcel Tolkowsky" in his book "Diamond Design". Any cut made before 1919.
Carat :
The carat (ct) is a unit of mass equal to 2 g. Carat is used for measuring the weight of gemstones.
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