Lets start with gold-plated.
Which moves us onto gold vermeil.
The process of creating gold vermeil jewellery is very similar to gold plated, the main difference between the two is that vermeil is dipped in for a longer period of time to compose a thicker layer of gold. Unlike gold plated jewellery, the base layer must be sterling silver, which needs to be plated in at least 2.5 microns of gold for it to qualify as gold vermeil. To the naked eye vermeil can easily be confused with solid gold jewellery, as visually they look very similar. Solid gold jewellery tends to have a slightly lower concentration of gold, which means it will have a lighter hue than gold-plated and vermeil jewellery.
So which is better?
Well It depends on what kind of jewellery you're after. Gold jewellery is a good choice If you're looking for a piece that will last a life time. But if you want to build a collection of fashion forward pieces without the pure gold price tag, demi-fine jewellery like gold-plated and gold vermeil are both great options.