Diamond Carat Size Chart Guide with Pricing Variation

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Carat is the unit of measurement for the physical weight of diamonds. Diamond Carat is often confused by the term ‘size’ but it is actually the measure of a diamond’s weight and a reflection of its size.
In simple terms, Carat is the weight of the diamond, how much a diamond can weigh. And the diamond weight of One carat (1ct) equals to 0.20 grams (200 Milligrams).

Understating Diamond Carat – 4cs

Diamond Carat 4cs

Each Carat of a diamond is divided into 100 points for accurate measurements where one point is equal to 0.01 carat.
Therefore, a Half-carat (1/2) diamond can also be described as 50 points OR 0.50 carat diamond and One Fourth (1/4) carat diamond is called as 25 points OR 0.25 carat diamond in terms of Carat weight. Whereas Diamond weights greater than one carat are expressed in carats and decimals. For E.g. a 1.08 carat stone would be described as ‘one point oh eight carats.’

After determining Cut, Color, Clarity of the 4c’s, Carat becomes the most appealing factor in choosing a diamond. Because that decides the final value of a diamond. Diamond prices increases with the diamond carat weight. Larger diamonds are always more precious and desirable. But it is important to know that 2 diamonds of equal carat weight vary in prices depending on the other 3 factors of diamond (Cut, Color, and Clarity).
Hence, the 4th C, Carat has least impact on diamond’s appearance but it’s the primary factor to calculate the price of a diamond.

Changes In Diameter (MM) And Price As Per Carats Size

To understand diamond pricing we have to take one example stone. Lets take G Color, Vs1 Clarity, Excellent Cut for below four diamonds. Please note price of a diamond is determined on many factors beyond 4 cs.  Below table is just to give your basic idea about diamond pricing with change in size.

Carat WeightSizeDiameter (MM)Price Per CaratTotal Price
0.50 ct0.50 diamond size5.1 mm3000 $1500 $
1.00 ct1.00 diamond size6.4 mm6000 $6000 $
2.00 ct2.00 carat diamond8.1 mm12000 $24000 $
3.00 ct3.00 diamond carat size9.3 mm18000 $54000 $

The above table depicts how the diameter and prices increases with the carat weight.

Firstly, let’s understand the % Increase In Diameter (MM) as per the Carat Weight
There is a common misunderstand that half a carat (0.50) is half the size of one carat (1.00) but the fact is half a carat is just half the weight of one carat. However, the Diameter (millimetre) difference is not the half of it. For instance, The measurement for a Round 0.50 ct diamond is 5.1 mm while the Round 1.00 ct diamond measures at 6.4 mm so the millimetre difference on a round diamond is 1.3 mm which is only 25% (from 5.1 mm to 6.4 mm) Thus, this shows even if the carat weight doubles, diameter does not increases with the same percentage.

Now, let’s see the Relationship between the Price and Size of a Diamond
From the table, we can see the price increases with the higher carat weight. For instance, when the carat weight gets tripled (from 1.00 ct to 3.00 ct ) prices per carat also get tripled(from 6000$ – 18000$). But total value of diamond jumps very high with increase in size. For example total price of 0.50 ct diamond is 1500$ ( 0.50 x 3000 $), where as price of 2 carat is 16 times more of 0.50 ct stone ( 2.00 x 12000 $). Increase in size of diamond means more rare and thus expensive.

How Carat Weight Points Affects the Price

Diamonds are generally cut to a rounded number 0.70 OR 1.00 ct rather than  0.69ct OR 0.99ct. But it is the most important to understand to prefer 0.98-0.99 ct over 1.00ct. The difference in size will be negligible, but you can save a significant amount.

Carat WeightPrice Per Carat
0.90 ct - 0.99 ctE VVS2 - 6000$
1.00 ct - 1.49 ctE VVS2 - 8000 $

For instance:  If you buy a diamond that weighs 0.98 carats, it would cost $ 5880 (0.98 x $6000). But if you buy a diamond that weighs 1.00 ct, it would cost $8000 (Assuming diamond has same Cut, Color, and Clarity) so here 0.98 pointer can costs nearly 25% less than a carat. Hence it is highly recommended to consider points as they cost less than diamonds whose weight has been rounded up.

To conclude, if the cut of a diamond possibly has the greatest impact on the overall desirability of a diamond, the carat has the heaviest impact on its pricing. And as diamond increases in size and carat weight, the price will increase at an increasing rate because larger diamonds are rarer and thus more valuable.

Got Question about diamond carat weight ? or Have something to add? use below comment box to share your views.

Thanks, Good Day.

Harsh Shah

Harsh Shah

Harsh Shah is the director of Pasavaja Gems LLP. He holds various diamond education degrees from GIA, De Beers Institute & Rapaport Acadamy. Harsh love assisting people to buy diamonds with his expert buying skills, market knowledge, and years of experience. Being loose diamond as his family business, he always wants to bring transparency and educate customers about diamonds. Apart from running diamond trading & manufacturing operations, he is extremely passionate about Internet Marketing, SEO & SMM.

5 thoughts on “Diamond Carat Size Chart Guide with Pricing Variation”

  1. Your blog provides great information..Would it be possible for you to share the Rapaport price list..I am looking to buy a diamond for a bracelet and unable to decide which diamond carat weight to choose . VS1 I 0.92 or VS1 I 1.2
    I assume that the price difference will be quite a lot but is it worth it to spend on 1.2

    • Hi Ishita,

      Thanks for commenting.

      We really like to help you with your every question related to diamonds.

      However, there is a change in the policy of Rapaport (Price list), Due to copyright issues, we are not allowed to reproduce or reshare the entire price list.

      Although we can help you with diamond prices per carat and with discounts of specific stone you are looking for.

      Kindly send the detailed specification or certificate of your diamonds for further assistance.

      Good Day!!


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