diamond sizes

When it comes to choosing a diamond ring, you’ll hear about the Four C’s of diamonds (cut, colour, clarity, and carats). There’s something else you’ll want to know though, if you’re viewing rings online and therefore can’t actually see the physical object. It’s ‘just how big is that diamond?’.  With that in mind, here’s our guide to diamond sizes by carat weight.

We’re concentrating on round brilliant cut diamonds only, because that remains by far the most popular cut. However, the principles involved for how physical size increases in proportion to carat weight still hold true for other cuts, such as baguette, princess, emerald, and so on.

Round Brilliant Cut Diamond Size Chart

diamond size carat weight

Diamond size v weight

The first thing you’ll notice is that just because one diamond is twice as heavy as another, it doesn’t mean that it will look twice as large.

For instance, a 2 carat round brilliant cut diamond has a diameter of 8mm, while a 1 carat diamond is 6.5mm across. So while it only has half the weight, it has much more than half the size.

Likewise, a 0.5 carat diamond has a diameter of 5mm – which is more than three-quarters of the size of a 1 carat diamond that weighs twice as much.

Diamond size v price

This is good news when it comes to getting the most of your budget for a diamond ring, as a slightly smaller diamond can be significantly cheaper than a slightly larger one.

For example, the difference in size between a 0.33 carat diamond and a 0.5 carat diamond is just 0.6mm – too small for most people to actually notice the difference. This means you can make significant savings by choosing a ring featuring a diamond or diamonds which are only marginally smaller, but almost equally impressive.

This is particularly relevant if you happen to be shopping at the upper end of the range for a large solitaire stone. For example, a two carat diamond can be almost five times the price of a 1.5 carat diamond, because they are so much rarer in nature. However, the gain in physical size between 1.5 and 2 carats is just 0.5mm.

We’re here to help!

Size isn’t everything when it comes to diamonds, but it is important. With our help and advice at Lorimat Jewellers in Kilkenny, you’ll be able to find a ring featuring a diamond or diamonds at the right size for you, in the right style, and at the right price.

Browse our rings online, book an appointment to see us for expert personal advice, or just call in to us at 24 Patrick Street in Kilkenny. We look forward to helping you.

About Lorimat Jewellers

Lorimat Jewellers are leading suppliers in the South East of Ireland of engagement rings, wedding rings, and eternity rings of vintage design and style. We offer modern interpretations of timeless classics, and for decades, we have helped couples to show their love in the greatest way possible by helping choose the perfect rings for them.