Finding the value of a diamond can be difficult for anyone without much knowledge on what makes a diamond valuable, and how one is graded. Luckily, many diamond price calculators are available online that can help you determine the value of your diamond. Theses calculators will ask for the grade that your stone is rated at in various categories along with its shape. If you have any documentation that came with your diamond, it could provide some of the gradings that will be needed to find its value. Even if you are unsure on what the grades of your diamond may be, we will help you with the different categories below.

Want to skip the details and just figure out how much your diamond is worth? We recommend just getting a quote one of two ways:

Diamond Buyers Intl – This is the quick and dirty way to get a quote. Especially if you have a certificate, you can just send it back to these guys and they’ll give you a price within hours (or minutes).

WP Diamonds – Want to enter all of your information for a more in-depth understanding of your diamond and what you’re being quoted? WP Diamonds has a great quote process that makes it easy for you to provide accurate information on your diamond.

Want to learn more about how diamonds are priced? Read on!

Diamond Shapes

The first thing that you will be asked for in the calculator is the shape of the diamond. Ten of the most common diamond shapes are listed and you can choose the one that best matches your stone. The shapes are displayed from looking down on top of the diamond and the lines represent different cuts. Notice the subtle differences in cuts between shapes like Radiant and Asscher. If you cannot determine exactly what shape your diamond is, choose the closest matching shape.

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Determining The Weight Of Your Diamond

Next, you will enter the weight of your diamond. Diamonds are measured by weight using carats and the typical center stone on diamond rings is 1-2 carats. Loose diamonds and jewelry pieces also can contain many smaller diamonds. If you do not know the weight of your diamond, use one of the methods below to find the carats.

Kitchen Scale Method
Using a scale that measure in grams, weigh your diamond.
Because 1ct. = .2g, divide the weight of your diamond in grams by .2

For example, if your diamond weighed .3 grams, divide .3 by .2
.3/.2 = 1.5ct

Measurement Method
Use the formula below that matches the cut of your diamond.

Round & Oval Cuts – Weight in carats = Diameter 1 in mm x Diameter 2 in mm x Depth in mm x 0.006


Example: 2mm x 2mm x 4mm x .006 = .096ct

Square & Rectangular Cuts – Weight in carats = Length x Width x Depth x Coefficient


The coefficient is determined by the length-to-width ratio of the diamond. Divide the length by width to find the ratio and choose the closest coefficient below.

Length/Width Ratio = 1.25 – Coefficient = 0.0080
Length/Width Ratio = 1.50 – Coefficient = 0.0090
Length/Width Ratio = 2.00 – Coefficient = 0.0100
Length/Width Ratio = 2.50 – Coefficient = 0.0105

Example: 4mm x 2mm x 2mm x Coefficient
L/W Ratio – 4/2 = 2.00 – Coefficient = 0.0100

4mm x 2mm x 2mm x 0.0100 = .16ct

Once you have found the weight of your diamond in carats using one of the methods above, enter the amount of carat in the box or use the slider on the diamond value calculator.

What Color Is My Diamond?

Colorless diamonds are worth the most money and the value decreases as the amount of yellow tint increases. The grading scale for a diamond’s color goes from D (Colorless) – Z (Yellow). The diamond price calculator only goes from D – M, but anything above M is not commonly used in jewelry due to lack of demand with its noticeably yellow tint. The exact color of a diamond can be hard to determine without the proper tools but you can look at the chart below and narrow it down to one of the three categories

Colorless – D E F
If your diamond falls into this category it will be hard to distinct whether it is D, E, or F with the naked eye. These colorless diamonds are commonly used with platinum and white gold because with yellow gold the colorless is wasted with the tint from the gold setting.

Near Colorless – G H I J
Diamonds in this category will contain small traces of tint, yet still are acceptable in platinum jewelry as it often goes unnoticed. Despite all being considered near colorless, the value of a G graded diamond can be significantly more than one graded at a J.

Faint Tint – K L M
The yellow tint is usually able to be detected easily around K graded diamonds. When used in yellow gold, the tint can be more difficult to see, making them a great value for many as they are often worth half the value of a G graded diamond.


Despite the difficulty in determining what the color grade of your diamond is, you should be able to make a good estimate from using the descriptions and pictures. Just like you did with the carats, move the slider on the diamond calculator to where you best think your diamond grades.

Grading A Diamond’s Clarity

The last thing you will need to determine for the diamond calculator is the clarity of your diamond. There are eleven different grades that are broken into six categories ranging from the most valuable being FL (Flawless) to the least valuable being I3 (Included/Imperfect). These gradings are determined under 10x magnification. Any magnifying glass or eye loupe you may have lying around your house will be beneficial to providing an accurate clarity grade. Below are the different grading categories:

Flawless (FL) – Using 10× magnification, no inclusions or blemishes can be seen by a skilled grader

Internally Flawless (IF) – Blemishes are visible to a skilled grader under 10× magnification but no inclusions

Very, Very Slightly Included (VVS1 and VVS2) – Under 10× magnification, inclusions are difficult to see

Very Slightly Included (VS1 and VS2) – A skilled grader using 10x magnification has little difficulty seeing minor inclusions

Slightly Included (SI1 and SI2) – Inclusions are noticeable to a skilled grader under 10x magnification

Included (I1, I2, and I3) – Transparency and brilliance are affected and inclusions are obvious under 10× magnification

Again you can do your best to determine where your diamond falls on this scale. Once you have moved the last slider to the diamond value calculator, click the Appraise My Diamond button on the bottom.

From here, you will wait just a few moments while Diamond Buyer’s International determines three other factors that will affect the value of your diamond. These three factors are, the buyer demand, peak-season pricing, and what they currently have in their inventory, all things that could dramatically increase the value of your diamond that other buyers might not take into consideration.

Once your diamond has qualified for DBI’s satisfaction-guaranteed offer, just enter your email address and you will receive your offer shortly.

If you are still unsure of selling your diamond, read our review on Diamond Buyer’s International and find more about their process and how easy it is to sell diamonds online below:
Diamond Buyer’s International Review