Ordering a lab grown diamond ring - or any cvd diamond ring - online is easy right up until you hit the size dropdown. Get it wrong and a beautiful ring turns into a resizing errand. The good news: getting an accurate ring size at home takes about five minutes and no special tools. Here's exactly how to do it.
Why Ring Size Matters More Than You'd Think
A ring that's slightly too loose will spin around your finger or slide off entirely. One that's too tight will pinch at the knuckle and leave marks by the end of the day. Unlike earrings or a pendant, a ring's fit is not something you can eyeball - it needs an actual measurement, and that measurement can shift slightly with temperature, time of day, and even how much water you've had. That's why we recommend measuring more than once before you commit to a size.
Method 1: Measure an Existing Ring
If you already own a ring that fits the finger you're buying for comfortably, this is the most reliable method.
1. Lay the ring flat on a table.
2. Measure the internal diameter - the distance straight across the inside of the band, in millimetres.
3. Match that measurement to the closest size on Xazina's Size Guide.
This works especially well if you're buying a lab grown diamond engagement ring and want to confirm sizing using a ring your partner already wears often, ideally on the same finger.
Method 2: The String or Paper Strip Method
No existing ring to measure? This works just as well.
1. Wrap a thin strip of paper or a piece of string snugly around the base of the finger.
2. Mark the point where the ends meet with a pen.
3. Lay the strip flat and measure the length in millimetres with a ruler.
4. This number is your finger's circumference - use our Size Guide chart to convert it to the nearest Xazina size.
A few tips that make a real difference in accuracy: measure at the end of the day, when fingers are at their largest (not first thing in the morning); avoid measuring right after exercise or in cold weather, both of which temporarily shrink finger size; and if you're between two sizes, size up rather than down - a ring that's slightly loose is a quick, inexpensive fix, while one that's too tight usually needs a full resize.
Wide Bands Need a Size Up
If the ring you're ordering has a wider band - think eternity bands or statement solitaire settings rather than slim classic bands - go up half a size from your measured size. Wider bands sit more snugly against the finger than thinner ones, so the same internal diameter will feel tighter.
Still Not Sure? Talk to Us Before You Buy
If your measurement falls awkwardly between two sizes, or you're ordering lab grown diamond couple ring or cvd diamond couple rings and want to be doubly sure before checkout, it's worth a quick message rather than a guess. Our team can talk you through it over WhatsApp before you place the order, and every Xazina ring purchase includes lab grown diamond ring resizing support if the fit isn't quite right the first time.
A Note on Custom Pieces
If you're going the custom design route - building a bespoke engagement ring or a fully personalised piece - sizing is confirmed with you directly as part of the design process, so there's no guesswork at all. Explore custom jewellery design if that's the route you're considering.
Ready to Find Your Size?
Getting your ring size right at home takes minutes and saves you the back-and-forth of a resize later. Head to our Size Guide to match your measurement, then buy lab grown diamond jewellery with confidence that your ring will fit the way it should from the moment it arrives.
