The right chain size for a diamond necklace depends on personal preference and the pendant or design you plan to wear. Consider the length and weight of the pendant to ensure it hangs at the desired position on your neck. A general guideline is to choose a chain length that complements your neckline and provides a comfortable fit. It's recommended to try on different chain lengths before making a decision to find the one that suits you best. For certain necklaces, we do offer chain extenders to make your necklace more comfortable.