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.