When it comes to gold, you want to consider the karat, link style, and clasp.
The higher the karat, the higher the price. But what people don’t realize is the higher the karat, the softer the gold. So when choosing, the most popular is 14k & 18k because of the durability and color.
The lower the karat the lighter the gold.
Next to consider is the chain-link style and width. The style of chain will automatically attract the eye so no need to stress on this. Some keep it classic with a rope or franco chain. Herringbone and Figaro chains are flatter but wider styles. The width of your chain is all about how flashy you choose to be.
Don’t forget to take a look at the clasp of the chain to make sure it’s going to hold up well. If you have a pendant for your chain, keep in mind a lobster clasp will easily fit through pendant holes. But check the size of the pendant hole and clasp size before purchasing to make sure it will fit. There are also spring clasps for thinner chain styles worn simply by themselves.