There are also some cases of blackening of 21- and 22-carat gold jewelry. Generally, gold items that are made with alloys such as copper or silver can tarnish 22-carat gold jewelry and turn it black. One of the most likely reasons why gold turns black is due to metal abrasion or poor quality coating and corrosion. Any type of hard metal can easily change the actual color of gold, while plating can also discolor.
Jewelry made of pure gold doesn't tarnish because it doesn't corrode or rust, but gold pieces made with an alloy such as copper or silver can tarnish and turn black. Gold jewelry can also darken when frequently exposed to everyday soap, lotion, and dirt. Clean gold jewelry with care; rough handling or abrasive, aggressive cleaners can do more harm than good. With proper care, gold jewelry retains its brilliance and beauty for many years.
Your best solution is to choose the non-porous plate material, including platinum, to protect the gold. Since gold is a relatively soft metal, most jewelers mix it with other metals such as silver, copper and nickel to increase its hardness and durability. Gold is precious, but at the same time it is sensitive enough, requiring massive maintenance and regular care. The purity of gold is measured in carats (not to be confused with carats, which are used to measure diamonds), and 1 carat (kt) is equivalent to 4.166% of gold by weight, while 24-carat gold is 100% pure gold.
Most gold items consist of a combination of alloyed metals such as silver or copper and gold, and these alloyed metals make gold jewelry black. Gold turns black when some base metals alloyed with gold react with oxygen or even oxygen, which can eventually discolor or even tarnish gold jewelry. You'll know when you wear a cosmetic made of some metals that it's harder than gold. It is also important to clean jewelry with an appropriate cleaning solution to remove dirt, sweat or chemicals that may react with the metals in gold jewelry and prevent them from breaking or damaging.
Sometimes, the real cause of jewelry turning black is due to careless maintenance, which is very necessary for gold jewelry. To clean a gold jewel that has turned black, you must first cover a medium bowl with a sheet of aluminum foil. Elements such as sulfur and chlorine react with the other metals in gold jewelry, causing them to corrode and turn black, thus blackening the skin underneath. Any gold jewelry will also darken if it has been frequently exposed to the use of soap or lotion.
Often, gold jewelry can cause a blackening of the skin under the ring, but there are several reasons beyond the purity of the gold that could be the cause. However, some people will continue to experience discoloration even with the purest gold jewelry, while others will not, regardless of its purity.