Yellow gold :
Yellow 18K gold is an alloy contianing 75% of pure gold, whereas 14K gold contains only 58,5% of pure gold.
Carat :
The carat (ct) is a unit of mass equal to 2 g. Carat is used for measuring the weight of gemstones.
Tourmaline :
Tourmaline is a group of ssemi-precious silicates. Crystals may be green at one end and pink at the other, or green on the outside and pink inside, therefore called "watermelon" Tourmaline. Tourmalines come from Sri Lanka.
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