Millesimal fineness

Millesimal fineness is like a special way to measure how much pure metal is in a piece of jewelry or a coin. It's kind of like when you measure how much water is in your cup, but instead of using a measuring cup, we use a special scale called a millesimal fineness scale.

The millesimal fineness scale goes all the way from 0 to 1000. That might sound like a lot, but it helps us be really precise in measuring how much metal is in our jewelry or coins. So, if something has a millesimal fineness of 999, that means it's really close to being pure metal!

Sometimes jewelry or coins are made with a mixture of metals, like gold and silver. To figure out the millesimal fineness in that case, we just add up how much of each metal is in the mixture. For example, if our jewelry is made of 75% gold and 25% silver, we can use the millesimal fineness scale to figure out that it has a millesimal fineness of 750 (because 750 is 75% of 1000).

So, why do we care about millesimal fineness? Well, it can tell us a lot about the value and quality of our jewelry or coins. The higher the millesimal fineness, the more valuable and pure our piece is!