The same holds true for the gem and jewelry industry: For years a global manufacturing hub, China is emerging as the strongest consumer market for luxury products such as jewelry. Chinese consumers are now synonymous with luxury products, and this is true with gemstones and jewelry.
Pure gold is so soft it is rarely used in jewelry. Jewelers deal with various gold alloys, collectively called karat gold. Karat (K) tells the number of parts, by weight, of gold in 24 parts of alloy. The higher the percentage of pure gold, the higher the karat. Pure gold is 24K; 18K is 18 parts fine gold and 6 parts metal; 14K is 14 parts fine gold and 10 parts metal; and 10K is 10 parts fine gold and 14 parts other metal. A diamond certificate is a report that attests to the authenticity of a diamond.
Pure gold is very soft, So it can't be used for jewelry. So impurities are added to make it stronger. Most gold jewelry is 18 karat or less to make it so that it lasts longer, and doesn't wear away. Aisian jewellery is pure gold, 24 carat, 999.9 fine. Its heavier (although often made hollow) very,very soft, and a very yellow, in colour.