Resizing a ring is a delicate process that varies depending on whether the ring is being made larger or smaller. To enlarge a ring, a jeweler inserts a matching piece of metal at the cut, then welds, sands, and polishes it to make the addition invisible. This process might slightly reduce the ring's width by about 0.10mm and could remove any inside engraving. To reduce a ring's size, the process involves adjusting its dimensions without adding material. If the ring has gemstones or is made of a specific metal, the jeweler may stretch or compress the band accordingly. In both cases, the aim is to preserve the ring's beauty and ensure a perfect fit, though each method has its nuances and potential minor alterations to the original design.