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Cushion|Lab Grown|IGI

4.21ct D FL Cushion Lab Grown Diamond

EX • D/FL • IGI LG804605050

Shape and cutting style on the report: Cushion modified brilliant

Certificate IGI LG804605050

Diamond specifications and retailer prices

From $5,702 USD
As of October 26, 2026
Save $28,877 USD (84%) vs most expensive(unlock to see where)
21 retailers carry this diamond
Most expensive: $34,579 USD at With Clarity · As of October 30, 2026
View at With Clarity

About this 4.21ct lab-grown cushion diamond

This 4.21ct lab-grown cushion sits in the three to five carat band, graded D colour (colourless) and FL clarity (flawless or internally-flawless), with a top-tier cut grade and certified by IGI LG804605050 or 804605050. Listed at 21 retailers as of October 26, 2026, with prices from $5,702 to $34,579, a $28,877 spread on the same certified stone. With Clarity lists it at $34,579. 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

4.21
Carat
D
Color
FL
Clarity
Excellent
Cut

Specifications

CutExcellent
PolishExcellent
SymmetryExcellent
FluorescenceNone
Crown angle35.5°
Pavilion angle37.5°
OriginLab Grown
Grading LabIGI
CertificateIGI LG804605050
Dimensions10.97 × 8.56 × 5.72 mm
L/W Ratio1.28
Girdle conditionFaceted
Cert comments
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
10.97 mm8.56 mm4.21 ctD / FL
OriginLab Grown
CutExcellent
PolishExcellent
SymmetryExcellent
FluorescenceNone
CertificateIGI LG804605050
Side View
Table 61.0%Crown 35.5°Girdle: MED-STKPavilion 37.5°Culet: NoneDepth 66.8%

Caratlytics Score

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

Price History

Last verified: Oct 26
Current: $8,757 USD|Low: $5,505 USD|High: $33,923 USD|Avg: $13,301 USD|+0.3%
Retailer 1
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
With Clarity
October 30, 2026
Retailer 15$5,702 USD
Retailer 5$6,337 USD
Retailer 12$6,573 USD
Retailer 3$6,700 USD
Retailer 4$6,805 USD
Retailer 2$6,809 USD
Retailer 6$6,880 USD
Retailer 1$8,757 USD
Retailer 13$10,757 USD
Retailer 17$11,522 USD
Retailer 14$13,929 USD
Retailer 11$14,492 USD
Retailer 16$15,226 USD
Retailer 7$17,561 USD
Retailer 8$18,356 USD
Retailer 9$18,942 USD
Retailer 18$22,110 USD
Retailer 10$23,844 USD
With Clarity$33,923 USD

39 data points across 19 retailers

21 retailers$5,702 USD to $34,579 USD

A
Cheapest Retailer
-
$5,702 USD
A
Retailer 2
-
$6,337 USD
CA$8,802 CAD
View
A
Retailer 3
-
$6,573 USD
View
Final sale: no returns
A
Retailer 4
-
$6,700 USD
View
A
Retailer 5
-
$6,805 USD
View
Retailer 6
-
$6,809 USD
View
Price last confirmed 14 days ago
A
Retailer 7
-
$6,880 USD
View
A
Retailer 8
-
$8,757 USD
£6,895 GBP
View
B+
Retailer 9
-
$9,693 USD
£7,632 GBP
View
B+
Retailer 10
-
$10,757 USD
€10,245 EUR
View
B+
Retailer 11
-
$11,522 USD
View
B+
Retailer 12
-
$13,929 USD
£10,968 GBP
View
B+
Retailer 13
-
$14,492 USD
ZAR 234,123 ZAR
View
B
Retailer 14
-
$15,226 USD
View
B
Retailer 15
-
$17,561 USD
View
B
Retailer 16
-
$18,356 USD
View
B
Retailer 17
-
$18,942 USD
View
B
Retailer 18
-
$20,023 USD
View
B
Retailer 19
-
$22,110 USD
View
B
Retailer 20
-
$23,844 USD
View
Most Expensive
B
With Clarity
804605050 · Oct 30
$34,579 USD
View
20 more retailers have this diamond
Prices start from $5,702 USDSave up to $28,877 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
$5,702 USD