|Table of Contents|
|What is Gold?|
|What is the karat?|
|What is Gold Karat?|
18 KT GOLD & COLOR
Gold is a chemical element with the symbol Au and atomic number 79.
It is a dense, soft, malleable and ductile metal with a bright yellow color and luster, the properties of which remain without tarnishing when exposed to air or water.
What is the karat?
Since the pure gold is too soft to make exquisite jewelries. Therefore, the gold jewelries are almost alloy which are mixed with other metals, such as silver, copper, or zinc.
Pure gold is 24 karats. A unit karat of gold is equal to 1/24 part (4.1667%). The gold karat shows how many parts of gold and how many parts of other metals in a gold jewelry.
The following chart shows the differences between the different karats, and also shows the percentage of gold and other metals.
|Karats||Gold percentage||Other Metal percentage|
|24K||gold 100.00%||other metal 0.000%|
|22K||gold 91.60%||other metal 8.4%|
|18kt||gold 75.00%||other metal 25%|
|14kt||0.25 to 0.35mm||0.35 to 0.5mm|
|10kt||gold 41.7%||other metal 58.300%|
|6kt||gold 25%||other metal 75%|
18 Karat is 18/24 or ¾ of Pure Gold. "parts per thousand". Therefore, 18 Karat gold is, 750 parts per thousand. e.g.: ( 750 gms P.G. + 250 gms Alloys ) = 1000.00 grams 18 Kt Gold.
Gold Color :
The government has made hallmarking of gold compulsory, which is a purity certification of the precious metal. The Bureau of Indian Standard (BIS) under the consumer affairs ministry is the administrative authority for hallmarking.
All jewellery by law is required to be stamped so that the consumer knows the quality of gold used. Jewellery made in North America is typically marked with the karat grade Eg. 18K and jewellery made in Italy is typically marked with the fineness such as eg. 750. So if your jewellery does not have a karat grade stamped on it, check for a 3-digit fineness number.
When trying to decide between the gold karat types there are three things to consider:
The BIS Hallmark & the 750 mark can be seen in the Image.
Rhodium is a plating process.Rhodiumis a very hard and durable metal related to platinum metals. Over a period of time white gold often show a yellowish cast of color due to the natural tarnish Rhodium is often plated over white gold to help keep the white gold looking white.
It is a plating process normally undertaken to give a bright silvery white look to the jewellery. We also rhodium plate any yellow gold piece to give it a temporary white gold look & effect. The rhodium plating normally wears off with usage & time.
NOTE : The plating of rhodium can wear off depending upon the customers use.