Half sizes exist for a reason, but not every ring comes in one. If you've measured yourself at a 6.5 and the ring you want only comes in 6 or 7, here's how to actually decide — and which of our rings solve the problem for you.
Round up, not down
A ring that's slightly loose is annoying. A ring that's slightly tight is a real problem — it won't go past your knuckle, or it will and then won't come back off. If you're stuck between two fixed sizes, size up. Our S925 Sterling Silver Oval Moissanite Ring ($69.50) ships in half sizes from US 5 through 7.5, and the Double-Tone Tungsten Steel Ring with 4mm to 8mm Beaded Pulling ($22.63) covers half sizes starting at US 4 — both stock narrow enough gaps that rounding up usually just means "not skin-tight," not "falls off."
When to skip fixed sizing entirely
If your size genuinely shifts — with temperature, time of day, or water retention — an adjustable or open ring removes the problem instead of managing it. The Modern Metal Stone Cross-Opening Design Ring ($6.01) and the Alloy Double-Layer Star Line Ring ($6.01) are both built with an adjustable opening instead of a fixed band. The Waterdrop Shaped Stainless Steel Inlaid Tiger Eye Stone Ring ($7.61) uses the same open-ring cut. None of these ask you to commit to an exact number.
Rings with wider size runs
Some styles simply stock more sizes, which shrinks the gap you're rounding across in the first place. The Sunflower Rotating Ring ($6.26) runs sizes 5 through 9, the Rotating Chain Gear Ring made of Titanium Steel ($6.01) runs 6 through 10, and the 8mm Zircon-Set Tungsten Steel Ring ($22.61) runs 5 through 9 as well. More stops on the size ladder means less rounding either way.
A quick way to hedge
If you're ordering online and can't try it on first, buy the adjustable or open-ring option when one exists in the style you want. It costs the same or less than the fixed-size version, and you skip the return shipping if your measurement was off by half a size. Save fixed sizing for styles like the moissanite ring, where the band needs to be a closed, finished circle and an adjustable version isn't an option.
If you haven't measured your finger yet, start there before picking a ring — a string or a strip of paper wrapped snugly around your knuckle, measured against a ruler, gets you close enough for anything on this list.