Jewellery, decoded
The things worth knowing before you buy, wear, or inherit a piece — researched, sourced, and written in plain English. No jargon for its own sake.
Reviewed August 4, 2026
- Marks
Hallmarks of the world
How fourteen jewellery nations mark precious metal — country by country — plus the interactive Hallmark Translator that cross-references purity between them.
- Diamonds
The 4Cs of a diamond
Cut, colour, clarity and carat — diamond quality decoded in plain English, with the GIA grading scales.
- Metals
Precious metals & karat
Gold, silver, platinum and palladium — karat and fineness, the conversion table, gold colours and the silver standards.
- Care
Jewellery care & Mohs
Clean it without ruining it — care by metal and stone, the Mohs hardness scale, and what to keep well away.
- Care · Shop
The Care Shelf
A curated kit to clean and store jewellery safely, with evidence-backed formulation and material attributes shown pick by pick.
- A–Z
Jewellery glossary
The terms you'll meet when buying or inheriting a piece — karat, fineness, the 4Cs, pavé, nacre — defined in plain English and searchable.
Gemstone Identifier
A separate free reference utility for narrowing the gem types a photo resembles. It remains a tool page, while this hub exposes the doorway.
Open the tool →- MyPiece editorial methodologyAccessed August 4, 2026