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 €3,537 EUR

$3,952 USD

As of November 1, 2026

Save €18,482 EUR (84%) vs most expensive(unlock to see where)

12 retailers carry this diamond

Most expensive: €22,019 EUR 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 €3,537 to €22,019, a €18,482 spread on the same certified stone. Do Amore Diamonds lists it at €22,019. 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

Colour

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

View IGI Report →View Loupe360 Video →

Top View

OriginLab Grown

CutIdeal

PolishExcellent

SymmetryExcellent

FluorescenceNone

CertificateIGI LG628448091

Side View

Caratlytics Score

How it works →

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: €22,019 EUR|Low: €3,537 EUR|High: €29,153 EUR|Avg: €10,464 EUR|-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€3,537 EUR

Retailer 10€3,706 EUR

Retailer 9€4,132 EUR

Retailer 3€5,036 EUR

Retailer 5€5,758 EUR

Retailer 6€7,008 EUR

Retailer 12€7,304 EUR

Retailer 2€8,779 EUR

Retailer 11€10,182 EUR

Retailer 8€11,681 EUR

Retailer 4€17,922 EUR

Do Amore Diamonds€22,019 EUR

31 data points across 12 retailers

12 retailers€3,537 EUR to €22,019 EUR

Cheapest Retailer

€3,537 EUR

$3,952 USD

Retailer 2

€3,706 EUR

$4,140 USD

View

Retailer 3

€4,132 EUR

$4,616 USD

View

Retailer 4

€5,036 EUR

$5,626 USD

View

Final sale: no returns

Retailer 5

€5,758 EUR

$6,433 USD

View

Retailer 6

€7,008 EUR

View

Retailer 7

€7,304 EUR

$8,160 USD

View

Price last confirmed 13 days ago

B+

Retailer 8

€8,779 EUR

£7,723 GBP

View

B+

Retailer 9

€10,182 EUR

$11,375 USD

View

B+

Retailer 10

€11,681 EUR

$13,050 USD

View

Retailer 11

€17,922 EUR

$20,023 USD

View

Most Expensive

Do Amore Diamonds

27-AD300EFA9 · Oct 31

€22,019 EUR

$24,600 USD

View

11 more retailers have this diamond

Prices start from €3,537 EURSave up to €18,482 EUR

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.

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4.21ct Cushion

€3,537 EUR