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Cushion|Lab Grown|IGI

4.21ct D FL Cushion Lab Grown Diamond

ID • D/FL • IGI LG628448091

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

Certificate IGI LG628448091

Diamond specifications and retailer prices

From $7,012 NZD
$3,952 USD
As of November 1, 2026
Save $36,636 NZD (84%) vs most expensive(unlock to see where)
12 retailers carry this diamond
Most expensive: $43,648 NZD at Do Amore Diamonds · As of October 31, 2026
View at Do Amore Diamonds

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 LG628448091 or 628448091. Listed at 12 retailers as of October 31, 2026, with prices from $7,012 to $43,648, a $36,636 spread on the same certified stone. Do Amore Diamonds lists it at $43,648. 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
Ideal
Cut

Specifications

CutIdeal
PolishExcellent
SymmetryExcellent
FluorescenceNone
Crown angle37.5°
Pavilion angle37.6°
OriginLab Grown
Grading LabIGI
CertificateIGI LG628448091
Dimensions9.23 × 9.07 × 6.15 mm
L/W Ratio1.02
Girdle conditionFaceted
Culet sizePointed
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
9.23 mm9.07 mm4.21 ctD / FL
OriginLab Grown
CutIdeal
PolishExcellent
SymmetryExcellent
FluorescenceNone
CertificateIGI LG628448091
Side View
Table 58.0%Crown 37.5°Girdle: THK-VTKPavilion 37.6°Culet: NoneDepth 67.8%

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: Nov 1
Current: $43,648 NZD|Low: $7,012 NZD|High: $57,789 NZD|Avg: $20,742 NZD|-24.5%
Do Amore Diamonds
Retailer 2
Retailer 3
Retailer 4
Retailer 5
Retailer 6
Retailer 7
Retailer 8
Retailer 9
Retailer 10
Retailer 11
Retailer 12
November 1, 2026
Retailer 7$7,012 NZD
Retailer 10$7,346 NZD
Retailer 9$8,190 NZD
Retailer 3$9,982 NZD
Retailer 5$11,414 NZD
Retailer 6$13,893 NZD
Retailer 12$14,478 NZD
Retailer 2$17,403 NZD
Retailer 11$20,183 NZD
Retailer 8$23,155 NZD
Retailer 4$35,527 NZD
Do Amore Diamonds$43,648 NZD

31 data points across 12 retailers

12 retailers$7,012 NZD to $43,648 NZD

A
Cheapest Retailer
-
$7,012 NZD
$3,952 USD
A
Retailer 2
-
$7,346 NZD
$4,140 USD
View
A
Retailer 3
-
$8,190 NZD
$4,616 USD
View
A
Retailer 4
-
$9,982 NZD
$5,626 USD
View
Final sale: no returns
A
Retailer 5
-
$11,414 NZD
$6,433 USD
View
A
Retailer 6
-
$13,893 NZD
€7,457 EUR
View
Retailer 7
-
$14,478 NZD
$8,160 USD
View
Price last confirmed 13 days ago
B+
Retailer 8
-
$17,403 NZD
£7,723 GBP
View
B+
Retailer 9
-
$20,183 NZD
$11,375 USD
View
B+
Retailer 10
-
$23,155 NZD
$13,050 USD
View
B
Retailer 11
-
$35,527 NZD
$20,023 USD
View
Most Expensive
B
Do Amore Diamonds
27-AD300EFA9 · Oct 31
$43,648 NZD
$24,600 USD
View
11 more retailers have this diamond
Prices start from $7,012 NZDSave up to $36,636 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
$7,012 NZD