Złoto, gold-plated and gold-filled jewelry are very similar in concept. Only slight differences in execution and materials distinguish these three methods.
Gold-plated jewelry
There is no standard metal or gold thickness when it comes to gold-plate. You can find gold plate in a variety of thicknesses and on a range of varying metals and alloys. With gold-plating, there is the high likelihood of the gold finish wearing out and chipping over time as the gold coating is very thin.
Gold-filled jewelry
Gold-filled jewelry is more valuable than gold-plate. It contains more gold as the gold coating is quite thick. Also, the base metal used for gold-filled items is often a gold alloy. This is hypoallergenic and also does not tarnish. Gold-filled is the next best thing to solid gold. This is why it is costlier than gold-plate or even vermeil.
Gold vermeil is similar to gold-plate in terms of affordability and amount of gold used. The main difference between the two is that vermeil has its strict standards and is made entirely of precious metals (both silver and gold are considered precious metals) while gold plate has different levels of gold thickness and is made with any base metal. If the same criteria is met for both, gold plate and gold vermeil can be one and the same!