what does this symbol mean?

Jewelry and gems

What the marks, grades and stones in jewelry mean.

Birthstones 12 symbols

The birthstone for each month, its colours, and where the modern list comes from.

Jewelry marks 21 symbols

The stamps inside rings, chains and clasps, and what each one says about the metal.

Diamond grading 19 symbols

The grades on a diamond report: clarity, color, cut and carat, and what each letter and number means.