Jewels refers to Gemstones or Diamonds eg jewel studded Crown. Jewellery refers to decorative items that adorn the body or clothes eg Rings-body, Brooches-clothing etc. Jewellery can be created from many different materials including precious metals such as silver and gold etc and can incorporate Jewels.

jewelry. noun. jew·​el·​ry ˈjü-əl-rē ˈjül-rē : ornamental pieces (as rings and necklaces) worn on the person : jewels.

Humans have used jewellery for a number of different reasons: functional, generally to fix clothing or hair in place. as a marker of social status and personal status, as with a wedding ring. as a signifier of some form of affiliation, whether ethnic, religious or social.

Jewels (or gems or gemstones) are rare minerals. They usually come in colours and sizes. They begin in a rough rock form, but can be cut and polished to turn into a jewellery.