How much does a 4 carat lab-grown diamond cost?

As of August 2026, a 4 carat lab-grown round diamond typically sells for $3,140–$3,620, with a fair market price of $3,340. Based on 34 live listings, updated 2026-08-15. Source: The Diamond Price (thediamondprice.com).

How much does a 4 carat Round lab-grown diamond cost?

The price of a 4 carat lab-grown Round diamond varies based on the 4Cs (cut, color, clarity, and carat). Prices typically range from $480 to $2,850, with a median price of $684. Use our real-time price calculator to get accurate pricing based on your specific quality parameters.

What factors affect 4 carat Round diamond prices?

The main factors affecting 4 carat Round diamond prices are: 1) Cut quality (Excellent to Poor), 2) Color grade (D-Z scale, with D being colorless), 3) Clarity (FL to I3, with FL being flawless), and 4) Certification (GIA, AGS, IGI). Additional factors include fluorescence, polish, symmetry, and current market demand.

Is a 4 carat Round diamond a good size?

A 4 carat Round diamond is a popular choice that offers excellent presence and value. The Round shape provides beautiful brilliance and fire, making it an excellent option for engagement rings. This size is substantial enough to make a statement while remaining practical for everyday wear.

What is the best quality 4 carat Round diamond for my budget?

For the best value in a 4 carat Round diamond, consider a G-H color grade with VS1-VS2 clarity and Excellent or Very Good cut. This combination offers excellent visual appeal while optimizing your budget. The cut quality is most important for brilliance, so prioritize Excellent cut even if it means compromising slightly on color or clarity.

Should I buy a certified 4 carat Round diamond?

Yes, always purchase a certified 4 carat Round diamond from a reputable laboratory like GIA, AGS, or IGI. Certification provides independent verification of the diamond's characteristics and ensures you're getting what you pay for. For diamonds of this size, certification is essential for both value protection and resale potential.

How much can I save with a 4 carat lab-grown Round diamond?

A 4 carat lab-grown Round diamond typically costs 40-60% less than an equivalent natural diamond. This significant savings allows you to either stay within budget or upgrade to a larger or higher quality stone. Lab-grown diamonds are chemically and optically identical to natural diamonds.

What setting is best for a 4 carat Round diamond?

A 4 carat Round diamond pairs beautifully with various settings. Popular options include solitaire settings for maximum brilliance, halo settings to enhance size and sparkle, or three-stone settings for added elegance. The Round shape works particularly well in settings that complement its unique faceting pattern.

What is the difference between natural and lab-grown diamonds?

Natural diamonds are formed deep within the Earth over billions of years, while lab-grown diamonds are created in controlled laboratory environments in a matter of weeks. Both have identical physical, chemical, and optical properties. The main differences are origin, price (lab-grown are typically 30-40% less expensive), and rarity. Both are real diamonds and can be certified by major gemological laboratories.

How often are diamond prices updated?

Our diamond prices are updated daily based on real-time market data from thousands of certified diamonds across major retailers. We analyze current inventory, pricing trends, and market conditions to provide the most accurate and up-to-date pricing information available.

Where is the best place to buy a diamond?

The best place to buy a diamond is from reputable online retailers or established local jewelers who offer certified diamonds, transparent pricing, and good return policies. Online retailers often offer better prices due to lower overhead costs. Always verify certification, compare prices across multiple sources, and ensure the seller has a strong reputation and customer reviews.

How much does a 4 carat lab-grown diamond cost?

As of August 2026, a 4 carat lab-grown round diamond typically sells for $3,140–$3,620, with a fair market price of $3,340. Based on 34 live listings, updated 2026-08-15. Source: The Diamond Price (thediamondprice.com).

How much does a 4 carat Round lab-grown diamond cost?

The price of a 4 carat lab-grown Round diamond varies based on the 4Cs (cut, color, clarity, and carat). Prices typically range from $480 to $2,850, with a median price of $684. Use our real-time price calculator to get accurate pricing based on your specific quality parameters.

What factors affect 4 carat Round diamond prices?

The main factors affecting 4 carat Round diamond prices are: 1) Cut quality (Excellent to Poor), 2) Color grade (D-Z scale, with D being colorless), 3) Clarity (FL to I3, with FL being flawless), and 4) Certification (GIA, AGS, IGI). Additional factors include fluorescence, polish, symmetry, and current market demand.

Is a 4 carat Round diamond a good size?

A 4 carat Round diamond is a popular choice that offers excellent presence and value. The Round shape provides beautiful brilliance and fire, making it an excellent option for engagement rings. This size is substantial enough to make a statement while remaining practical for everyday wear.

What is the best quality 4 carat Round diamond for my budget?

For the best value in a 4 carat Round diamond, consider a G-H color grade with VS1-VS2 clarity and Excellent or Very Good cut. This combination offers excellent visual appeal while optimizing your budget. The cut quality is most important for brilliance, so prioritize Excellent cut even if it means compromising slightly on color or clarity.

Should I buy a certified 4 carat Round diamond?

Yes, always purchase a certified 4 carat Round diamond from a reputable laboratory like GIA, AGS, or IGI. Certification provides independent verification of the diamond's characteristics and ensures you're getting what you pay for. For diamonds of this size, certification is essential for both value protection and resale potential.

How much can I save with a 4 carat lab-grown Round diamond?

A 4 carat lab-grown Round diamond typically costs 40-60% less than an equivalent natural diamond. This significant savings allows you to either stay within budget or upgrade to a larger or higher quality stone. Lab-grown diamonds are chemically and optically identical to natural diamonds.

What setting is best for a 4 carat Round diamond?

A 4 carat Round diamond pairs beautifully with various settings. Popular options include solitaire settings for maximum brilliance, halo settings to enhance size and sparkle, or three-stone settings for added elegance. The Round shape works particularly well in settings that complement its unique faceting pattern.

What is the difference between natural and lab-grown diamonds?

Natural diamonds are formed deep within the Earth over billions of years, while lab-grown diamonds are created in controlled laboratory environments in a matter of weeks. Both have identical physical, chemical, and optical properties. The main differences are origin, price (lab-grown are typically 30-40% less expensive), and rarity. Both are real diamonds and can be certified by major gemological laboratories.

How often are diamond prices updated?

Our diamond prices are updated daily based on real-time market data from thousands of certified diamonds across major retailers. We analyze current inventory, pricing trends, and market conditions to provide the most accurate and up-to-date pricing information available.

Where is the best place to buy a diamond?

The best place to buy a diamond is from reputable online retailers or established local jewelers who offer certified diamonds, transparent pricing, and good return policies. Online retailers often offer better prices due to lower overhead costs. Always verify certification, compare prices across multiple sources, and ensure the seller has a strong reputation and customer reviews.

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4 Carat Lab-Grown Round Diamond Prices

Fair Market Price:

$3,340

View All Diamonds →

Best Deal:

-15% $2,840

See Best Deal →

Current Market Range:

$3,140 – $3,620

Browse This Range →

Today's Recommendation

Excellent time to buy

Moderate confidence · Based on 34 diamonds

Lab-grown round prices have been on a steady, multi-year decline - down 31% just in the past year. There's no urgency: this is an ongoing trend, not a closing window, and waiting may cost you less still.

Why?

✓ Prices fell 31% vs. last year
✓ 16.7% of listings checked qualify as strong deals
✓ 19% fewer diamonds listed than a year ago

4 Carat Round Price History

Price index for lab-grown round diamonds moved −30.7% over the past year.

1 month −7.2%

1 year −30.7%

16 months −38.0%

Mar 2025 309 days measured of 522 · E–F colour, VVS1–VVS2 clarity Aug 2026

The Diamond Price Index tracks the median asking price of every comparable lab-grown round diamond listed each day, indexed to 100 at the start. It shows how the market has moved; for what a stone costs today, see the fair market price above.

Best 4 carat round deals right now

Best deal

3.71 ct · G · VS2

$2,840

▼ 15% under fair price

👑 Best Overall

3.76 ct · G · VS2

$2,880

▼ 14% under fair price

Closer to the 4 ct you're browsing

3.73 ct · G · VS1

$3,140

Based on 500,000+ diamonds tracked in real time · How we compute fair prices

Round engagement rings

Round Solitaire 4.03 CT Engagement Ring i…

$29,445

Round Solitaire 4.01 CT Lab-Grown Engagem…

$33,530

Round Pave 4 CT Engagement Ring in Platin…

$36,776

Round Pave 4.02 CT Engagement Ring in Pla…

$37,526

Round Vintage Pave 4.01 CT Engagement Rin…

$39,020

Market Analysis What this means for you

Supply is thin for this spec right now.
34 comparable diamonds analyzed — buyers have limited negotiating power.
Best listing today is 15% below fair market price.
You shouldn’t pay more than $2,982 for this spec.

Price distribution 34 listings

6 diamonds
$2,840–$3,042 5 diamonds
$3,042–$3,244 8 diamonds
$3,244–$3,445 6 diamonds
$3,445–$3,647 3 diamonds
$3,647–$3,849 0 diamonds
$3,849–$4,051 0 diamonds
$4,051–$4,253 1 diamond
$4,253–$4,455 2 diamonds
$4,455–$4,656 1 diamond
$4,656–$4,858 0 diamonds
$4,858–$5,060 2 above
over $5,060

Fair market
$3,340 Best deal
$2,840 Best overall
$2,880

Best $2,840 Overall $2,880 Fair $3,340

Fair market price: $3,340
Typical market range: $3,140 – $3,620
Best deal today: $2,840 15% below
Best overall today: $2,880

Round by carat market range

4 Carat Diamond Prices Table

Below are the current 4 carat lab-grown diamond prices for the most popular diamond shapes. Each price is the median of the diamonds listed right now at this size and quality band. Click a shape for detail.

Shape	Typical price range	vs Round	Live stones
4ct Marquise View details →	$5,060 – $5,840	▼ 17% less than round	53
4ct Heart View details →	$5,200 – $6,200	▼ 8% less than round	48
4ct Pear View details →	$5,170 – $6,200	▼ 6% less than round	58
4ct Princess View details →	$5,160 – $6,170	▼ 5% less than round	115
4ct Emerald View details →	$5,460 – $6,960	▼ 3% less than round	40
4ct Cushion View details →	$5,970 – $7,020	▼ 2% less than round	23
4ct Oval View details →	$5,290 – $6,120	▼ 1% less than round	137
4ct Radiant View details →	$5,170 – $6,970	▼ 1% less than round	57
4ct Round View details →	$5,530 – $6,170	Reference	168

Each figure is the median asking price of that shape’s live listings — not a like-for-like comparison between shapes. Cut grade is the biggest single driver of a diamond’s price, and our retailers don’t publish it, so we won’t tell you one shape is cheaper than another when we can’t hold cut constant.

Compare another shape at 4 ct

Frequently Asked Questions

The price of a 4 carat round diamond varies significantly based on the 4Cs (cut, color, clarity, and carat). On average, you can expect to pay anywhere from $2,000 to $25,000+ depending on quality. Use our price index above to see current market prices.

4 carat is a popular choice for engagement rings, offering excellent visibility and presence on the finger. It strikes a balance between size and value, making it one of the most sought-after carat weights.

Diamond prices fluctuate based on market supply and demand, currency exchange rates, mining output, and consumer trends. Seasonal factors like engagement season can also affect prices. Tracking historical prices helps you identify the best time to buy.

Both natural and lab-grown diamonds are genuine diamonds with identical physical properties. Lab-grown diamonds typically cost 40-60% less than natural diamonds of equivalent quality. Your choice depends on personal preference, budget, and values.

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4 Carat Round Price History

Best 4 carat round deals right now

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4 Carat Diamond Prices Table

About 4 Carat Round Diamond Prices

Why Track Round Diamond Prices?

What Affects 4 Carat Diamond Prices?

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