They are hard to resell. Solid gold jewellery contains high quantity of gold and will always resell even when they are damaged. Buyers should always ask the sellers if the item they are interested in is real solid gold. Most of the solid gold items are stamped which show the content of gold.
375 stamp means 9ct solid gold. 750 or 18k are solid 18 carat gold.
585 or 14k represent 14 carat solid gold. After you receive the item always get them checked by a professional. Please contact me if you would like to know anything about gold hallmarks or anything else. I'm always happy to help.