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Round|Lab Grown|IGI

4.20ct D IF Round Lab Grown Diamond

ID • D/IF • IGI LG754594373

Shape and cutting style on the report: Round brilliant

Certificate IGI LG754594373

Diamond specifications and retailer prices

From $1,908 USD
As of October 26, 2026
Save $21,672 USD (92%) vs most expensive(unlock to see where)
17 retailers carry this diamond
Most expensive: $23,580 USD at Brilliant Earth · As of October 28, 2026
View at Brilliant Earth

About this 4.2ct lab-grown round diamond

This 4.2ct lab-grown round sits in the three to five carat band, graded D colour (colourless) and IF clarity (flawless or internally-flawless), with a top-tier cut grade and certified by IGI LG754594373 or 754594373. Listed at 17 retailers as of October 26, 2026, with prices from $1,908 to $23,580, a $21,672 spread on the same certified stone. Brilliant Earth lists it at $23,580. Lab-grown prices in the 2ct and up range have fallen 40 to 60% over the last 18 months. Use the cross-retailer spread above to find the lowest current listing.

The 4Cs

4.20
Carat
D
Color
IF
Clarity
Ideal
Cut

Specifications

CutIdeal
PolishExcellent
SymmetryExcellent
FluorescenceNone
Crown angle34.3°
Pavilion angle40.8°
OriginLab Grown
Grading LabIGI
CertificateIGI LG754594373
Dimensions10.35 × 10.39 × 6.37 mm
L/W Ratio1.00
Girdle conditionFaceted
Culet sizePointed
Cert comments
HEARTS & ARROWS As Grown - No indication of post-growth treatment This Laboratory Grown Diamond was created by High Pressure High Temperature (HPHT) growth process Type II
Top View
10.35 mm10.39 mm4.20 ctD / IF
OriginLab Grown
CutIdeal
PolishExcellent
SymmetryExcellent
FluorescenceNone
CertificateIGI LG754594373
Side View
Table 56.0%Crown 34.3°Girdle: MED-STKPavilion 40.8°Culet: NoneDepth 61.4%

Caratlytics Score

How it works →
A
Excellent
Excellent quality and great value
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See the detailed 0 to 100 score with Quality, Value, Certification & Market breakdown

Price History

Last verified: Oct 26
Current: $23,580 USD|Low: $1,908 USD|High: $24,300 USD|Avg: $6,259 USD|-3.0%
Brilliant Earth
Retailer 2
Retailer 3
Retailer 4
Retailer 5
Retailer 6
Retailer 7
Retailer 8
Retailer 9
Retailer 10
Retailer 11
Retailer 12
Retailer 13
Retailer 14
Retailer 15
Retailer 16
Retailer 17
October 29, 2026
Retailer 14$1,908 USD
Retailer 4$2,076 USD
Retailer 15$2,311 USD
Retailer 9$2,400 USD
Retailer 12$2,870 USD
Retailer 3$3,358 USD
Retailer 13$3,466 USD
Retailer 17$3,634 USD
Retailer 8$3,671 USD
Retailer 10$3,945 USD
Retailer 5$5,100 USD
Retailer 6$5,360 USD
Retailer 11$6,120 USD
Retailer 2$6,664 USD
Retailer 7$10,811 USD
Retailer 16$13,130 USD
Brilliant Earth$23,580 USD

33 data points across 17 retailers

17 retailers$1,908 USD to $23,580 USD

A
Cheapest Retailer
-
$1,908 USD
A
Retailer 2
-
$2,076 USD
View
A
Retailer 3
-
$2,311 USD
View
A
Retailer 4
-
$2,400 USD
View
Final sale: no returns
A
Retailer 5
-
$2,870 USD
View
A
Retailer 6
-
$3,358 USD
View
A
Retailer 7
-
$3,466 USD
View
A
Retailer 8
-
$3,634 USD
View
A
Retailer 9
-
$3,671 USD
View
A
Retailer 10
-
$3,945 USD
€3,757 EUR
View
A
Retailer 11
-
$5,100 USD
View
A
Retailer 12
-
$5,360 USD
A$8,246 AUD
View
A
Retailer 13
-
$6,120 USD
View
B+
Retailer 14
-
$6,664 USD
£5,247 GBP
View
B+
Retailer 15
-
$10,811 USD
A$16,632 AUD
View
Price last confirmed 20 days ago
B+
Retailer 16
-
$13,130 USD
View
Most Expensive
B
Brilliant Earth
17680491Y · Oct 28
$23,580 USD
View
16 more retailers have this diamond
Prices start from $1,908 USDSave up to $21,672 USD

Carat Hunter is not affiliated with, endorsed by, or sponsored by any retailer listed. Retailer information is from publicly available sources and may not be current. Verify details directly with the retailer before purchasing. Return terms as we hold them. Check the retailer's own returns page before you buy.

A
4.20ct Round
$1,908 USD