It's nice to be a jeweller. Especially if you are going to get married. You can save some money and make rings that nobody has. Here's what Julia and Alexey exactly did.
Pure gold is very soft and needs to be mixed with such other metals as silver, copper, etc. to become more solid. That's why when they say "sixteen carat gold" for example, it does not mean only gold but some admixtures too.
Here Alexey is holding a piece of horn-beech.