The carat sytem of diamonds is actually pretty simple. Just think of the carat system like you'd think of the monetary system. Tge carat system is broken into "points." Each "point" is like one penny. 1.00ct (1 carat) is comparable to a dollar ($1). .50ct (1/2 carat) would be comparable to 50 cents. It would follow then, that .25ct would be like 25 cents. In your case, a .012 would refer to 12 points, or 12 cents to the dollar. Theres a great tutorial on precious metals and diamonds that you can read if you want more information. Just click on the "Related Link" at the bottom of this post.
Another Answer
If the characters '.012' are stamped in the metal, the stamp may have no relationship to the stone mounted in the ring. Take your ring to your local jeweler, who can look at it and help you decipher the stamp and give you an informal assessment of the stone.
FL on a diamond ring probably means the diamond or diamonds are flawless.
This indicator means that if all the diamonds in the ring were removed, their combined carat total weight, would be equal to one-half a carat.
925 on a ring mean
The term "1.00kt" inside a ring typically refers to the carat weight of a diamond or gemstone set within the ring, indicating that the stone weighs one carat. In the context of jewelry, carat weight is a key factor in determining the value and size of the gemstone. Therefore, a ring marked with "1.00kt" suggests it features a significant and valuable stone.
.012.
what does pt mean on diamond ring
Diamond Essence - simulated diamond
c = diamond
A diamond promise ring has many meanings, but they generally means that the giver of the promise ring will be faithful to the receiver of the promise ring.
Vargas
My ring has that stamp but I can find no answer to my question
Diamond solitaire indicates that a piece of jewelery, usually a ring, is set with a single diamond.
An x on a diamond ring means you will have good look in the future with your job or even winning the lottery.
14K nickel white
leo diamond
DC stands for Diamond Cut.
The ".925" stamp on a diamond engagement ring indicates that the metal is sterling silver. It does not necessarily mean the diamond is real; the authenticity of the diamond would need to be verified separately by a gemologist or a jeweler.