How Many Carats? Choosing a Centre Diamond Size for an Engagement Ring
Buying guide
Most people picture a 1 carat diamond when they think of an engagement ring: a round stone about 6.5 mm across. There is no right number; choose by budget first, then by how the stone looks on the hand. In our 18K gold Classic rings, such as the Classic Round Diamond Ring and the Classic Oval Diamond Ring, a 1 ct centre diamond costs AED 6,000 lab-grown or AED 45,000 natural (November 2026), and a 2 ct lab-grown stone costs AED 8,000.
Shop the Classic Round Diamond Ring18K gold · Free delivery in the UAE · Pay in instalments with Tabby or Tamara (UAE and KSA) · Help on WhatsApp
By Lana Al Kamal
Founder and jewellery designer, GIA-trained, Dubai · Updated 12 November 2026
As featured in
Harper's Bazaar ArabiaEmirates WomanGrazia ArabiaJdeed MagazineKey takeaways
- A 1 ct round diamond is about 6.5 mm across; 2 ct is about 8.2 mm, not twice as wide.
- In our Classic rings, lab-grown costs AED 6,000 (1 ct), 8,000 (2 ct) or 10,600 (3 ct); natural costs AED 20,000 (0.5 ct), 45,000 (1 ct) or 105,000 (2 ct), November 2026.
- Long shapes such as oval, pear and marquise look larger than a round of the same carat.
Every carat, size and price
| Carat | Round, about | Lab-grown (CVD)* | Natural* |
|---|---|---|---|
| 0.5 ct | 5.1 mm | Not offered | AED 20,000 |
| 1 ct | 6.5 mm | AED 6,000 | AED 45,000 |
| 2 ct | 8.2 mm | AED 8,000 | AED 105,000 |
| 3 ct | 9.3 mm | AED 10,600 | Not offered |
*Classic Round, Oval, Emerald, Cushion, Heart and Marquise rings in 18K gold, prices as of November 2026, the same in every gold colour and size. Millimetres are typical for a well-cut round diamond; the exact measurements are on each diamond's report.
Pieces in this guide
Is 1 carat big enough?
For most hands, yes. A 1 ct round covers a good part of the finger's width without looking heavy, and it is the size most people expect. On a slim finger it looks larger; on a wider finger, 1.5 to 2 ct gives a similar effect. If you want more presence without a higher budget, choose lab-grown: in our Classic rings, 2 ct lab-grown (AED 8,000) costs less than a fifth of 1 ct natural (AED 45,000). Our CVD lab-grown diamond guide explains what you are buying.
Why 2 carats does not look twice as big
Carat is weight, not width. A diamond grows in three directions, so doubling the weight from 1 ct to 2 ct adds only about a quarter to the width you see from the top: roughly 6.5 mm to 8.2 mm. Compare sizes in millimetres, not only in carats, and check the measurements on the IGI or GIA report.
What to buyClassic Round Diamond Ring, from AED 6,000Which shapes look biggest per carat?
Long shapes spread their weight across more of the finger. An oval, pear or marquise usually looks larger than a round of the same carat; an emerald cut can look a little smaller because more of its weight sits in depth. If size on the hand matters most, read our oval diamond ring guide; for the most sparkle, read the round brilliant diamond ring guide.
Carat, colour and clarity: where to spend
- Budget first: decide on natural or lab-grown, because that changes the price far more than any grade.
- Then carat: pick the size that looks right on the hand.
- Then the grades: a well-cut round hides a slight tint and small inclusions, so you rarely need the top colour or clarity grade to get a bright stone. GIA explains the grades on its diamond quality factors page.
Gold colour, size, engraving and timing
Each Classic ring comes in 18K yellow, white or rose gold, in EU sizes 48 to 65 (the product page shows the full list), with free engraving inside the band. Rings are made to order, with about 15 working days of production before shipping; shipping then takes about 3 working days within the UAE and about 5 to Saudi Arabia. Our team contacts you after you order to confirm the details. For more, read our engagement ring guide for the UAE and Saudi Arabia, or see all our diamond rings.
Frequently asked questions
How many carats should an engagement ring be?
There is no rule. 1 ct is the size most people picture; choose by budget first, then by how the stone looks on the hand.
How big is a 1 carat diamond?
A well-cut 1 ct round diamond is about 6.5 mm across. A 2 ct round is about 8.2 mm.
How much is a 1 carat diamond ring at Lana Al Kamal?
In our 18K gold Classic rings, AED 6,000 with a 1 ct lab-grown diamond or AED 45,000 with a 1 ct natural diamond, in November 2026.
Which carat options can I choose?
Lab-grown CVD at 1, 2 or 3 ct, or natural at 0.5, 1 or 2 ct.
Which shape looks biggest for its carat?
Long shapes such as oval, pear and marquise usually look larger than a round of the same carat weight.
Not sure which one?
Send our team a photo or a question on WhatsApp and we will help you choose.
WhatsApp our teamKeep reading
Engagement Ring Guide for the UAE and Saudi ArabiaRound Brilliant Diamond Ring Guide: Cut, Carat and PriceCVD Lab-Grown Diamonds Explained: How They Are Made and What They Cost
About Lana Al Kamal
Lana Al Kamal is an architect and jewellery designer who founded her Dubai-based fine jewellery brand in 2018. She studied at the Gemological Institute of America (GIA) and is a member of the Dubai Chamber jewellery designers group. Most pieces are made in 18K gold.
