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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 $10,117 NZD
$5,702 USD
As of October 26, 2026
Save $51,236 NZD (84%) vs most expensive(unlock to see where)
21 retailers carry this diamond
Most expensive: $61,354 NZD at With Clarity · As of October 31, 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 $10,117 to $61,354, a $51,236 spread on the same certified stone. With Clarity lists it at $61,354. 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
Colour
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: $18,951 NZD|Low: $9,768 NZD|High: $60,190 NZD|Avg: $23,585 NZD|+2.2%
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 31, 2026
Retailer 15$10,117 NZD
Retailer 5$11,244 NZD
Retailer 3$11,888 NZD
Retailer 4$12,074 NZD
Retailer 2$12,081 NZD
Retailer 6$12,207 NZD
Retailer 11$13,841 NZD
Retailer 12$15,538 NZD
Retailer 1$18,951 NZD
Retailer 17$20,443 NZD
Retailer 14$24,715 NZD
Retailer 13$25,714 NZD
Retailer 16$27,015 NZD
Retailer 7$31,158 NZD
Retailer 8$32,569 NZD
Retailer 9$33,610 NZD
Retailer 18$39,230 NZD
Retailer 10$42,306 NZD
With Clarity$60,190 NZD

39 data points across 19 retailers

21 retailers$10,117 NZD to $61,354 NZD

A
Cheapest Retailer
-
$10,117 NZD
$5,702 USD
A
Retailer 2
-
$11,244 NZD
CA$8,802 CAD
View
A
Retailer 3
-
$11,888 NZD
$6,700 USD
View
A
Retailer 4
-
$12,074 NZD
$6,805 USD
View
Retailer 5
-
$12,081 NZD
$6,809 USD
View
Price last confirmed 15 days ago
A
Retailer 6
-
$12,207 NZD
$6,880 USD
View
A
Retailer 7
-
$13,841 NZD
$7,801 USD
View
Final sale: no returns
A
Retailer 8
-
$15,538 NZD
£6,895 GBP
View
B+
Retailer 9
-
$17,198 NZD
£7,632 GBP
View
B+
Retailer 10
-
$18,951 NZD
€10,172 EUR
View
B+
Retailer 11
-
$20,443 NZD
$11,522 USD
View
B+
Retailer 12
-
$24,715 NZD
£10,968 GBP
View
B+
Retailer 13
-
$25,714 NZD
ZAR 234,123 ZAR
View
B
Retailer 14
-
$27,015 NZD
$15,226 USD
View
B
Retailer 15
-
$31,158 NZD
$17,561 USD
View
B
Retailer 16
-
$32,569 NZD
$18,356 USD
View
B
Retailer 17
-
$33,610 NZD
$18,942 USD
View
B
Retailer 18
-
$35,527 NZD
$20,023 USD
View
B
Retailer 19
-
$39,230 NZD
$22,110 USD
View
B
Retailer 20
-
$42,306 NZD
$23,844 USD
View
Most Expensive
B
With Clarity
804605050 · Oct 31
$61,354 NZD
$34,579 USD
View
20 more retailers have this diamond
Prices start from $10,117 NZDSave up to $51,236 NZD

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
$10,117 NZD