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Start with a professional ring measurement, ideally taken at the same time of day you'll typically wear the ring (fingers swell slightly throughout the day and in warmer weather). If you're pairing the band with an engagement ring, measure with the engagement ring on, since it affects how the band sits. Band width matters too: a 6mm wide band will feel tighter than a 2mm band at the same ring size, so wider bands often need to go up a half size for a comfortable fit.

No. Mixed metals are common and have been throughout jewelry history. Yellow gold bands paired with platinum engagement rings, for example, were standard practice during the Retro era (1935 to 1950). The practical consideration is whether the metals have different hardness levels. Platinum is harder than gold, so over years of contact a platinum ring can wear down an adjacent gold band slightly faster than two rings in the same metal. The effect is gradual and minor, but worth knowing.

A contour band is shaped with a curve or notch that follows the profile of an engagement ring setting, so the two rings sit flush against each other without a visible gap. They're most useful when pairing with engagement rings that have high-profile settings, extended prongs, or unusually shaped center stones like marquise or pear cuts. A straight band works fine with most solitaire and bezel settings, so a contour is not always necessary.

Most can, within a range of about one to two sizes in either direction. Plain bands and simple engraved bands resize well. Bands with stones set all the way around (eternity style) are difficult or impossible to resize without removing and resetting stones. Bands with detailed engraving or pattern work can sometimes be sized, but the engraving may need to be re-cut at the join point. The metal type and the condition of the band also factor in. A jeweler who works regularly with vintage pieces can evaluate a specific ring and give you a realistic range before you commit.

Most can, within a range of about one to two sizes in either direction. Plain bands and simple engraved bands resize well. Bands with stones set all the way around (eternity style) are difficult or impossible to resize without removing and resetting stones. Bands with detailed engraving or pattern work can sometimes be sized, but the engraving may need to be re-cut at the join point. The metal type and the condition of the band also factor in. A jeweler who works regularly with vintage pieces can evaluate a specific ring and give you a realistic range before you commit.