Rings come in all different shapes, sizes and materials. Gold, like silver, can become relatively malleable under high heat. For this reason, it's an easier element to mould and shape as jewellery. If you need to resize a gold ring to make it larger, a jeweller will need to add on more material. Although this may cost more money, it can be seamlessly done by a professional.
Determine your actual ring size. It's important to have your finger professionally sized (as opposed to guessing) to avoid the same mistake in the future. Your size can be taken by any jeweller, regardless of whether or not they size rings. There is a measurement tool that can help you find the right fit.
Locate two or three different jewellers in your area that offer resizing options and compare prices. Jewellers charge various prices for their services so it doesn't hurt to shop around to find the best deal.
Verify that your ring is made 100 per cent out of gold. If your ring contains other elements, the jeweller will not be able to seamlessly size it while welding on new gold. Attempting to size a ring incorrectly with another element may do permanent damage to the jewellery.
Always have your finger professionally sized before purchasing and sizing a ring.