Jewellery and gems
What the marks, grades and stones in jewellery mean.
Birthstones 12 symbols
The birthstone for each month, its colours, and where the modern list comes from.
Jewellery marks 21 symbols
The stamps inside rings, chains and clasps, and what each one says about the metal.
Diamond grading 10 symbols
The grades on a diamond report: clarity, color, cut and carat, and what each letter and number means.