How Big is a One Carat Diamond?

How big one-carat diamond? How big a diamond look will depend entirely on its dimension. The size of a one carat round brilliant diamond can range from approximately 6.20mm to 6.80mm in diameter, depending on the depth.

1 carat diamond

Different Diamond Carat on Hand

How much weight is 1 carat?

You should know that a carat is the measure of weight, and one carat is equal to 200 milligrams or 0.2 grams. The average round brilliant ideal cut diamond measures approximately 6.5mm in diameter, with slight variations due to the exact carat weight, and proportions of the diamond.

While there might not be much of a visual difference between a one carat round diamond, and one which falls just short of the 1.00 carat mark, and weighs in between 0.90-0.99 carats; there seems to be a mental difference created by being able to say, “it’s a one carat diamond” in response to the question “how big is it?”. However, many people with limited budget would choose 0.95-carat diamond to get an affordable diamond ring, while not sacrificing the look of a 1-carat diamond.

Therefore, diamond prices increase substantially at specific magic marks of carat weight, such as between the 0.99 and 1.00-carat marks; which is an important concept to understand. A one-carat diamond can weigh between 0.98-1.02 carats, thus being within two points of the mark, but there is a significant price difference between a 0.98-carat diamond and an actual 1.00-carat diamond.

Will there be a visual difference between 0.95 carats and 1.00-carat diamond?

If we’re talking about the visual difference between a 0.95 carat round brilliant ideal cut diamond, and a 1.00 carat, round brilliant ideal cut diamond, then the visual difference between the visible surface area of the two diamonds from a top-down perspective is going to be very slight, and it isn’t going to be that noticeable to anybody who is scrutinizing the two diamonds.

How the cut of the diamond can affect the diamond size

The cut is a great factor that affects the size of a diamond. The way a diamond is cut can greatly affect how big it looks. In general, cuts that are designed so that they are deeper tends to look smaller compared with shallower cuts, assuming the stones being compared have the same carat weight. Let’s look at the approximate measurements a one–carat stone has depended on the cut.

Round cut: around 6.55mm in diameter.

Square princess cut: approximately 5.55mm long on the side.

Emerald cut (rectangular): around 6.55mm long by 5mm wide (these sides can vary).

Radiant cut and cushion cut: approximately 6.0-6.55 mm by 5.0-5.55 mm.

Oval cut and pear cut: approximately 8.0-8.55 mm in length and 5.0-5.5mm in width.

Marquise cut: approximately 10mm long and around 5mm wide.

Keep in mind that these figures are approximate and actual size can vary depending on the proportions of the stone.

Two diamonds of equal carat weight can have very different costs based on other factors (such as cut, colour, and clarity). As the carat size of a diamond increases, the diamond’s price increases too. This is because the larger the diamond the more increasingly rare it is.

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