Where d is the initials of diamond, and ct is the abbreviation of carat, the weight unit of diamond. If the diamond ring has an assistant diamond, there will be a series of similar numbers and letters, except that D becomes D, which represents the total weight of the assistant diamond suit.
Extended data:
Cleaning method
1, cleaning solution cleaning method, fill a small bowl or teacup with warm water, and adjust an appropriate amount of neutral detergent in the water. Soak the diamond in water, brush it gently with a toothbrush, then wrap it with a sieve and rinse it with warm water under the tap. Finally, dry it with a soft cotton-free flannel.
2, cold water immersion method, use a small bowl or teacup, soak the diamond in water for about 30 minutes, then gently brush the diamond back and forth with a small brush, then wave it in the water for a while, and then dry it with a paper towel.
3, care for diamonds, you must also do three noes: when doing housework, don't let the diamond ornaments you wear be stained with bleach. Bleach will not damage the diamond ring, but it will make the metal inlay fade or produce spots. Don't pile diamond ring ornaments together in drawers or jewelry boxes, because diamond rings will "kill each other" when they rub against each other.
Baidu encyclopedia-diamond ring