1 Carat vs 1.20 Carat Diamonds Compared

Comparing 1 carat with 1.20 carat diamonds

Comparing a 1 carat diamond alongside 1.20 carats.

There is a noticeable size difference between a 1 carat diamond and a larger 1.20 carat diamond—this is evident when both diamonds appear alongside one another. Please note that we refer to 1 Carat diamonds, (and not 1 Carret diamonds or 1 Carrot diamonds – both inaccurate spellings.) Upwards from a 1 carat size to the 1.20 carat option increases cost but gives a greater show for any diamond ring.

Close up showing the 1 carat alongside the 1.20 carat diamond.

Showing 1 carat 6.4mm (left) compared to 1.20 carat diamond 6.75mm (right) both diamonds F VS1 and GIA certified. (Photography – Serendipity Diamonds concierge service.)

Diamond Measurements.

A typical 1 carat round brilliant cut diamond, measures between 6.3 – 6.5mm in diameter. By comparison, a 1.20 carat diamond will measure around 6.75mm in diameter. This small difference results in a noticeable difference between both diamond sizes.

Which is more expensive 1 carat or 1.20 carat?

The overall price per carat for either option should be very similar. However, the additional 1/5th carat increases cost based on the increase carat weight. Expect greater value for money when sourcing a 1.20 carat diamond compared to a 1.25 carat diamond. The full 1.25 carat weight will typically demand a small premium over the 1.20 carat weight owing to the increased rarity of the weight. A similar comparison can be made with smaller diamonds. Buying a 0.70 carat diamond will offer greater value for money than buying 0.75 carats. Besides the obvious weight difference, greater abundance means a lower cost compared to the fuller diamond weight.

Why to buyers choose 1.20 carats over 1.00 carats.

Buyers might choose a 1.20 carat diamond if they have purchased a 1 carat diamond in the past. They might choose to upgrade their diamond to increase size. Perhaps the 1.20 carat weight has a significance by number, or maybe the cost fits a specific budget for diamond colour and clarity. There are many reasons why a buyer will choose to exceed the 1 carat size. But unlike a small step to 1.10 carats, the 1.20 carat size gives a greater difference in physical size by comparison to the 1 carat diamond.

Best ways to source and compare diamonds

If you would like to source either a 1 carat or a 1.20 carat diamond, we offer a very helpful diamond concierge service. We often provide high resolution comparison photos for clients attempting to make decisions. We source and present detailed diamond certificate copies and clear photography for any clients unable to visit our UK showroom for viewings. Please contact us at any time for more support.

Mark Johnson

About Mark Johnson

Mark attended Liverpool University and went on to pursue a career in the diamond industry. After more than a decade working in polished diamonds, Mark moved to the Isle of Wight where he launched Serendipity Diamonds. He works most days from their busy Ryde showroom, photographing jewellery and writing for the Serendipity Diamonds website. Anyone interested can connect with Mark on Linkedin via the profile link.

Mark Johnson

About Mark Johnson

Mark attended Liverpool University and went on to pursue a career in the diamond industry. After more than a decade working in polished diamonds, Mark moved to the Isle of Wight where he launched Serendipity Diamonds. He works most days from their busy Ryde showroom, photographing jewellery and writing for the Serendipity Diamonds website. Anyone interested can connect with Mark on Linkedin via the profile link.