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Round|Lab Grown|IGI

4.20ct F IF Round Lab Grown Diamond

ID • F/IF • IGI LG579399216

Shape and cutting style on the report: Round brilliant

Certificate IGI LG579399216

Diamond specifications and retailer prices

From $3,023 USD
As of November 1, 2026
Save $41,573 USD (93%) vs most expensive(unlock to see where)
23 retailers carry this diamond
Most expensive: $44,596 USD at Mervis Diamond Importers · As of November 3, 2026
View at Mervis Diamond Importers

About this 4.2ct lab-grown round diamond

This 4.2ct lab-grown round sits in the three to five carat band, graded F colour (colourless) and IF clarity (flawless or internally-flawless), with a top-tier cut grade and certified by IGI LG579399216 or 579399216. Listed at 23 retailers as of November 1, 2026, with prices from $3,023 to $44,596, a $41,573 spread on the same certified stone. Mervis Diamond Importers lists it at $44,596. 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
F
Color
IF
Clarity
Ideal
Cut

Specifications

CutIdeal
PolishExcellent
SymmetryExcellent
FluorescenceNone
Crown angle35.4°
Pavilion angle40.8°
OriginLab Grown
Grading LabIGI
CertificateIGI LG579399216
Dimensions10.32 × 10.30 × 6.39 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
10.32 mm10.30 mm4.20 ctF / IF
OriginLab Grown
CutIdeal
PolishExcellent
SymmetryExcellent
FluorescenceNone
CertificateIGI LG579399216
Side View
Table 58.0%Crown 35.4°Girdle: MediumPavilion 40.8°Culet: NoneDepth 61.9%

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: Nov 1
Current: $44,596 USD|Low: $2,902 USD|High: $44,596 USD|Avg: $7,367 USD|+100.0%
Mervis Diamond Importers
Retailer 2
Retailer 3
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Retailer 19
November 3, 2026
Retailer 18$3,023 USD
Retailer 9$3,289 USD
Retailer 7$3,386 USD
Retailer 3$3,507 USD
Retailer 15$3,510 USD
Retailer 8$3,601 USD
Retailer 10$4,837 USD
Retailer 17$4,936 USD
Retailer 2$5,138 USD
Retailer 5$5,451 USD
Retailer 16$6,595 USD
Retailer 14$8,238 USD
Retailer 13$8,340 USD
Retailer 4$8,858 USD
Retailer 12$9,812 USD
Retailer 19$10,320 USD
Retailer 6$10,965 USD
Retailer 11$11,172 USD
Mervis Diamond Importers$44,596 USD

43 data points across 19 retailers

23 retailers$3,023 USD to $44,596 USD

A
Cheapest Retailer
-
$3,023 USD
A
Retailer 2
-
$3,289 USD
View
A
Retailer 3
-
$3,386 USD
View
Final sale: no returns
Retailer 4
-
$3,507 USD
View
Price last confirmed 21 days ago
A
Retailer 5
-
$3,507 USD
View
A
Retailer 6
-
$3,510 USD
View
A
Retailer 7
-
$3,601 USD
View
A
Retailer 8
-
$4,046 USD
View
B+
Retailer 9
-
$4,837 USD
View
B+
Retailer 10
-
$4,936 USD
View
B+
Retailer 11
-
$5,138 USD
£4,046 GBP
View
B+
Retailer 12
-
$5,451 USD
View
Retailer 13
-
$6,595 USD
View
Price last confirmed 12 days ago
B+
Retailer 14
-
$8,238 USD
ZAR 133,087 ZAR
View
B+
Retailer 15
-
$8,340 USD
A$12,830 AUD
View
B
Retailer 16
-
$8,858 USD
View
B+
Retailer 17
-
$9,812 USD
£7,726 GBP
View
B
Retailer 18
-
$10,320 USD
View
B
Retailer 19
-
$10,965 USD
View
Retailer 20
-
$11,172 USD
View
Price last confirmed 7 days ago
B
Retailer 21
-
$13,574 USD
View
B
Retailer 22
-
$20,800 USD
View
Most Expensive
B
Mervis Diamond Importers
1985409114 · Nov 3
$44,596 USD
View
22 more retailers have this diamond
Prices start from $3,023 USDSave up to $41,573 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
$3,023 USD