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Buy 3 Carat Lab Grown Diamonds

Shop our beautiful collection of 3 Carat Lab Grown Diamonds. Take advantage of our diamond transparency to see the wholesale cost of your diamond! Look for the best value badge to find the best priced diamonds in the market.

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Best Value
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Best Value
Shop loose diamonds in our inventory that we have identified as being Best Value. Best price and balance of the 4C's on the market.
Ritani Reserve Ritani Reserve
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Ritani Reserve
Ritani Reserve Diamonds are an exclusive selection of diamonds that have the best cut which offers maximum sparkle. They reflect the most light, maximum brilliance, fire, and scintillation.
Shape
Shape influences the personality and price of a diamond.
Price
Many factors impact diamond price. With Ritani's Diamond Price Match Guarantee you can be confident you'll get the best price for a diamond. Tip: Tradition tells you to budget 2-3 months' salary for your ring. We say, just do you.
Carat
Carat is the measure of a diamond's weight and size. We offer an array of high-quality diamonds ranging from 0.18 to 25.00 carats- with 1.00 carat being the most popular.
Color
A diamond’s color grade actually measures how little color it reflects. To strike the best balance between cost and beauty, go for diamonds in the Near Colorless range: G, H, and I.
Clarity
Clarity indicates how many flaws are visible to the naked eye. Too many flaws can detract from a diamond's beauty.
Cut
Cut is the quality of a diamond’s proportions and symmetry. The better a diamond’s proportions and symmetry, the more sparkle it will produce. Cut is the most important of the 4 Cs.
Delivery Date
In a rush to get your diamond? Choose your ideal delivery date.
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Polish
A well-polished diamond will have excellent light return.
Fluorescence
Some diamonds glow blue or green when exposed to UV light. Since fluorescence is rarely visible, it has minimal impact on the appearance of your diamond. To save money, go for medium fluorescence.
Depth
Depth percentage correlates with a diamond's sparkle factor. It is measured by dividing the diamond height by its diameter. For maximum sparkle, the depth percentage of a round diamond should be between 54% and 66%.
Length/Width Ratio
The proportional relationship between your diamond’s length and width. A perfect round diamond would measure equally 1-to-1, so its LxW ratio would measure as 1.
Symmetry
Symmetry tells you how well a diamond’s facets align to create sparkle. Diamonds with perfect symmetry create the most sparkle and earn a grade of Excellent or Ideal.
Table
Table percentage tells you how big a diamond’s topmost facet (aka table) is in comparison to its diameter (aka girdle). When that ratio is in the right range, a diamond will sparkle more.
Culet
The culet is the point at the bottom of the diamond. If the point has a facet on it, it can stop light from reflecting and detract from the diamond's sparkle. Choose a diamond with no culet for optimum sparkle.
Certificate
All of Ritani’s natural diamonds are certified by either the GIA or AGSL, the industry’s two most respected grading labs.
Polish
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A well-polished diamond will have excellent light return.
Excellent
Very Good
Good
Fluorescence
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Some diamonds glow blue or green when exposed to UV light. Since fluorescence is rarely visible, it has minimal impact on the appearance of your diamond. To save money, go for medium fluorescence.
None
Faint
Depth
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Depth percentage correlates with a diamond's sparkle factor. It is measured by dividing the diamond height by its diameter. For maximum sparkle, the depth percentage of a round diamond should be between 54% and 66%.
Length/Width Ratio
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The proportional relationship between your diamond’s length and width. A perfect round diamond would measure equally 1-to-1, so its LxW ratio would measure as 1.
Symmetry
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Symmetry tells you how well a diamond’s facets align to create sparkle. Diamonds with perfect symmetry create the most sparkle and earn a grade of Excellent or Ideal.
Excellent
Very Good
Good
Table
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Table percentage tells you how big a diamond’s topmost facet (aka table) is in comparison to its diameter (aka girdle). When that ratio is in the right range, a diamond will sparkle more.
Culet
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The culet is the point at the bottom of the diamond. If the point has a facet on it, it can stop light from reflecting and detract from the diamond's sparkle. Choose a diamond with no culet for optimum sparkle.
None
Very Small
Medium
Large
Certificate
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All of Ritani’s natural diamonds are certified by either the GIA or AGSL, the industry’s two most respected grading labs.
Lab Diamond Growth Process
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Lab diamonds are made using two processes, HPHT and CVD. Both mimic the natural process of earth diamonds. LEARN ABOUT LAB DIAMONDS

Best Value
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Best Value
Shop loose diamonds in our inventory that we have identified as being Best Value. Best price and balance of the 4C's on the market.
Ritani Reserve Ritani Reserve
Tool Tip Icon
Ritani Reserve
Ritani Reserve Diamonds are an exclusive selection of diamonds that have the best cut which offers maximum sparkle. They reflect the most light, maximum brilliance, fire, and scintillation.
3.23 Carat Round Lab Diamond
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Lab
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$1,006.00
3.23Carat
IColor
SI1Clarity
IdealCut

3.16 Carat Round Lab Diamond
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$1,018.00
3.16Carat
HColor
SI1Clarity
IdealCut

3.02 Carat Round Lab Diamond
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$1,045.00
3.02Carat
HColor
VS2Clarity
IdealCut

3.20 Carat Round Lab Diamond
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$1,045.00
3.2Carat
GColor
SI1Clarity
IdealCut

3.02 Carat Round Lab Diamond
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$1,045.00
3.02Carat
HColor
VS2Clarity
IdealCut

3.06 Carat Round Lab Diamond
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$1,045.00
3.06Carat
GColor
SI1Clarity
IdealCut

3.25 Carat Round Lab Diamond
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$1,047.00
3.25Carat
IColor
VS2Clarity
IdealCut

3.21 Carat Round Lab Diamond
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$1,049.00
3.21Carat
HColor
SI1Clarity
IdealCut

GEMOLOGIST PICKS
These diamonds were hand picked by our in house gemologists who focus on balancing the 4 C's and best value pricing. Our gemologists are always here to help you find the diamond of your dreams. Chat Now
3.19 Carat Round Lab Diamond
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$1,961.00
3.19Carat
GColor
VS1Clarity
IdealCut

3.21 Carat Round Lab Diamond
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$1,973.00
3.21Carat
GColor
VS1Clarity
IdealCut

3.10 Carat Round Lab Diamond
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$1,981.00
3.1Carat
GColor
VS1Clarity
IdealCut

Chat with a gemologist
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You can connect with a commission free gemologist instantly and receive a live diamond inspection on any diamond. You can also connect and shop together and compare up-to three diamonds at a time instantly. Try it out. Start your diamond concierge consultation today.
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3.04 Carat Round Lab Diamond
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$1,052.00
3.04Carat
HColor
VS2Clarity
IdealCut

3.21 Carat Round Lab Diamond
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$1,052.00
3.21Carat
GColor
VS2Clarity
IdealCut

3.00 Carat Round Lab Diamond
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$1,055.00
3Carat
HColor
VS2Clarity
IdealCut

3.05 Carat Round Lab Diamond
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$1,055.00
3.05Carat
HColor
VS2Clarity
IdealCut

3.14 Carat Round Lab Diamond
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$1,057.00
3.14Carat
GColor
SI1Clarity
IdealCut

3.06 Carat Round Lab Diamond
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$1,057.00
3.06Carat
IColor
VS2Clarity
IdealCut

3.02 Carat Round Lab Diamond
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$1,057.00
3.02Carat
HColor
SI1Clarity
IdealCut

3.01 Carat Round Lab Diamond
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$1,058.00
3.01Carat
GColor
SI1Clarity
IdealCut

3.01 Carat Round Lab Diamond
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$1,058.00
3.01Carat
GColor
SI1Clarity
IdealCut

3.22 Carat Round Lab Diamond
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$1,060.00
3.22Carat
HColor
VS2Clarity
IdealCut

3.12 Carat Round Lab Diamond
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$1,062.00
3.12Carat
HColor
VS2Clarity
IdealCut

3.02 Carat Round Lab Diamond
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$1,062.00
3.02Carat
HColor
VS2Clarity
IdealCut

3.24 Carat Round Lab Diamond
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$1,062.00
3.24Carat
GColor
VS2Clarity
IdealCut

3.13 Carat Round Lab Diamond
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$1,065.00
3.13Carat
HColor
VS2Clarity
IdealCut

3.13 Carat Round Lab Diamond
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$1,065.00
3.13Carat
HColor
VS2Clarity
IdealCut

3.13 Carat Round Lab Diamond
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$1,065.00
3.13Carat
HColor
VS2Clarity
IdealCut

You’ve viewed 24 of 30,000 products

Shop our beautiful collection of 3 Carat Lab Grown Diamonds. Take advantage of our diamond transparency to see the wholesale cost of your diamond! Look for the best value badge to find the best priced diamonds in the market.

3 Carat Lab Grown Diamonds by Ritani

Carat Weight

Undoubtedly impressive in its enormity, a 3-carat diamond, regardless of its cut or jewelry setting, is guaranteed to attract attention. An engagement ring featuring a 3-carat diamond always makes an unquestionably bold presentation, as the average carat size for an engagement ring in the United States is typically around 1 carat. While 3-carat stones look stunning in all diamond cuts, specific cuts distribute their weight differently from other shapes. For example, asscher-cut and cushion-cut diamonds are renowned for their depth, making them ideal for larger-carat stones.

All Ritani lab-grown diamonds are certified by International Gemological Institute, (IGI) the most respected independent lab diamond grading laboratory.

Lab Grown Diamonds

Lab grown diamonds are real diamonds that are created in the lab instead of deep inside the earth's crust. They are physically, chemically, and visually identical to earth grown diamonds and are indistinguishable even by a trained gemologist.

The only difference between lab grown diamonds and earth grown diamonds is how they were created. Earth grown diamonds are created under high pressure and temperature deep under the earth's surface, while lab grown diamonds are created under high pressure and temperature(HPHT) in a lab

Lab grown diamonds are typically between 30 and 50 percent cheaper than earth grown diamonds! Therefore they have become a very popular choice for engagement ring, since you can get a bigger size diamond for your budget.

All Ritani lab grown diamonds are certified. Most of our lab grown diamonds are certified by IGI, the most respected independent lab diamond grading laboratory.

If you need help selecting your 3 Carat Lab Grown Diamonds, reach out to us at 1-888-9RITANI or chat now.

Frequently Asked Questions

  • How much does a 3 Carat Lab Grown Diamond cost?
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    A 3 Carat Lab Grown Diamond can cost anywhere between $2,500 and $27,000 depending on the 4 Cs. The median price is $7,000.

  • How much does a 3 carat diamond weigh?
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    A 3 carat diamond weighs 0.6 grams or 600 milligrams.

  • How big is a 3 Carat Diamond?
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    3 Carat Diamonds do not all have the same dimensions, since carat is a measure of weight, not size.

    Here you can see the range of dimensions for a 3 Carat Diamond

    LowHighMedian
    Length (mm)7.516.69.3
    Width (mm)5.39.68
    Depth (mm)3.86.25.3
    Length to width ratio (mm)12.61.1