Here's a basic brand and a respected brand both using gold plating.
Amazon basics: https://www.amazon.co.uk/AmazonBasics-Male-B-Male-Cable-Feet...
Anker: https://www.amazon.co.uk/Anker-2-Pack-Nylon-Braided-Tangle-F...
Amazon basics: https://www.amazon.co.uk/AmazonBasics-Male-B-Male-Cable-Feet...
Anker: https://www.amazon.co.uk/Anker-2-Pack-Nylon-Braided-Tangle-F...
Unnecessary if you ask me... It's more like jewellery rather than a cable :-)
Zinc / aluminium is probably a better combination for USB, as it's more durable.