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Cushion|Lab Grown|IGI

4.21ct F VVS1 Cushion Lab Grown Diamond

VG • F/VVS1 • IGI LG835670909

Shape and cutting style on the report: Square cushion modified brilliant

Certificate IGI LG835670909

Diamond specifications and retailer prices

From $1,183 USD
As of November 1, 2026
Save $8,367 USD (88%) vs most expensive(unlock to see where)
19 retailers carry this diamond
Most expensive: $9,550 USD at Brilliant Earth · As of October 31, 2026
View at Brilliant Earth

About this 4.21ct lab-grown cushion diamond

This 4.21ct lab-grown cushion sits in the three to five carat band, graded F colour (colourless) and VVS1 clarity (very-very-slightly-included), with a very-good cut grade and certified by IGI LG835670909 or 835670909. Listed at 19 retailers as of October 31, 2026, with prices from $1,183 to $9,550, a $8,367 spread on the same certified stone. Brilliant Earth lists it at $9,550. Cut grade matters more than carat or clarity for visible brilliance. If you can shift budget toward an Excellent or Ideal cut, do it before chasing higher colour or clarity.

The 4Cs

4.21
Carat
F
Color
VVS1
Clarity
Very Good
Cut

Specifications

CutVery Good
PolishExcellent
SymmetryExcellent
FluorescenceNone
Crown angle38.6°
Pavilion angle28.6°
OriginLab Grown
Grading LabIGI
CertificateIGI LG835670909
Dimensions9.35 × 9.05 × 5.65 mm
L/W Ratio1.03
Girdle conditionFaceted
Cert comments
This Laboratory Grown Diamond was created by Chemical Vapor Deposition (CVD) growth process Type IIa
Top View
9.35 mm9.05 mm4.21 ctF / VVS1
OriginLab Grown
CutVery Good
PolishExcellent
SymmetryExcellent
FluorescenceNone
CertificateIGI LG835670909
Side View
Table 65.0%Crown 38.6°Girdle: STK-THKPavilion 28.6°Culet: NoneDepth 62.4%

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: Nov 1
Current: $9,550 USD|Low: $1,183 USD|High: $9,550 USD|Avg: $3,182 USD|+19.1%
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
Retailer 18
Retailer 19
November 2, 2026
Retailer 7$1,183 USD
Retailer 2$1,341 USD
Retailer 15$1,375 USD
Retailer 10$1,510 USD
Retailer 3$1,747 USD
Retailer 11$1,882 USD
Retailer 13$1,923 USD
Retailer 6$2,190 USD
Retailer 17$2,823 USD
Retailer 14$2,841 USD
Retailer 9$3,510 USD
Retailer 5$3,644 USD
Retailer 19$3,658 USD
Retailer 12$3,918 USD
Retailer 18$4,284 USD
Retailer 16$4,673 USD
Retailer 8$7,959 USD
Retailer 4$8,130 USD
Brilliant Earth$9,550 USD

30 data points across 19 retailers

19 retailers$1,183 USD to $9,550 USD

A
Cheapest Retailer
-
$1,183 USD
Final sale: no returns
A
Retailer 2
-
$1,341 USD
£1,056 GBP
View
A
Retailer 3
-
$1,375 USD
View
A
Retailer 4
-
$1,510 USD
View
A
Retailer 5
-
$1,572 USD
View
B+
Retailer 6
-
$1,882 USD
View
B+
Retailer 7
-
$1,923 USD
£1,514 GBP
View
B+
Retailer 8
-
$2,190 USD
View
B+
Retailer 9
-
$2,823 USD
ZAR 45,598 ZAR
View
B+
Retailer 10
-
$2,841 USD
A$4,371 AUD
View
B
Retailer 11
-
$3,510 USD
View
B
Retailer 12
-
$3,644 USD
View
B
Retailer 13
-
$3,658 USD
£2,880 GBP
View
B
Retailer 14
-
$3,918 USD
£3,085 GBP
View
B
Retailer 15
-
$4,284 USD
£3,373 GBP
View
B
Retailer 16
-
$4,673 USD
View
B
Retailer 17
-
$7,959 USD
View
B
Retailer 18
-
$8,130 USD
View
Most Expensive
B
Brilliant Earth
22270103A · Oct 31
$9,550 USD
View
18 more retailers have this diamond
Prices start from $1,183 USDSave up to $8,367 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
4.21ct Cushion
$1,183 USD