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Cushion|Lab Grown|IGI

5.21ct E SI1 Cushion Lab Grown Diamond

ID • E/SI1 • IGI LG750571205

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

Certificate IGI LG750571205

Diamond specifications and retailer prices

From €745 EUR
$832 USD
As of October 29, 2026
Save €2,943 EUR (80%) vs most expensive(unlock to see where)
14 retailers carry this diamond
Most expensive: €3,912 EUR at Rare Carat · As of October 21, 2026
View at Rare Carat

About this 5.21ct lab-grown cushion diamond

This 5.21ct lab-grown cushion sits in the over five carat band, graded E colour (colourless) and SI1 clarity (slightly-included), with a top-tier cut grade and certified by IGI LG750571205 or 750571205. Listed at 14 retailers as of October 29, 2026, with a 395% spread between the cheapest and most expensive listing. That is exactly the kind of price-discovery gap Carat Hunter was built to surface. SI-grade stones are eye-clean roughly 60 to 70% of the time at this carat range. Check the inclusion plot on the cert and ask the retailer for high-resolution video before buying.

The 4Cs

5.21
Carat
E
Color
SI1
Clarity
Ideal
Cut

Specifications

CutIdeal
PolishExcellent
SymmetryExcellent
FluorescenceNone
Crown angle37.1°
Pavilion angle40.2°
OriginLab Grown
Grading LabIGI
CertificateIGI LG750571205
Dimensions10.03 × 9.95 × 6.79 mm
L/W Ratio1.01
Girdle conditionFaceted
Culet sizePointed
Cert comments
This Laboratory Grown Diamond was created by Chemical Vapor Deposition (CVD) growth process Type IIa
Top View
10.03 mm9.95 mm5.21 ctE / SI1
OriginLab Grown
CutIdeal
PolishExcellent
SymmetryExcellent
FluorescenceNone
CertificateIGI LG750571205
Side View
Table 61.0%Crown 37.1°Girdle: MED-STKPavilion 40.2°Culet: NoneDepth 68.2%

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: Oct 29
Current: €3,912 EUR|Low: €531 EUR|High: €7,188 EUR|Avg: €2,310 EUR|-2.1%
Rare Carat
Retailer 2
Retailer 3
Retailer 4
Retailer 5
Retailer 6
Retailer 7
Retailer 8
Retailer 9
Retailer 10
Retailer 11
October 30, 2026
Retailer 10€745 EUR
Retailer 8€931 EUR
Retailer 11€1,146 EUR
Retailer 5€1,179 EUR
Retailer 4€1,240 EUR
Retailer 7€1,676 EUR
Retailer 3€1,984 EUR
Retailer 9€2,598 EUR
Retailer 6€3,049 EUR
Retailer 2€3,688 EUR
Rare Carat€3,912 EUR

39 data points across 11 retailers

14 retailers€745 EUR to €3,688 EUR

A
Cheapest Retailer
-
€745 EUR
$832 USD
Final sale: no returns
A
Retailer 2
-
€894 EUR
HK$7,800 HKD
View
A
Retailer 3
-
€931 EUR
$1,040 USD
View
B+
Retailer 4
-
€1,146 EUR
$1,280 USD
View
A
Retailer 5
-
€1,179 EUR
View
A
Retailer 6
-
€1,240 EUR
£1,090 GBP
View
B+
Retailer 7
-
€1,676 EUR
$1,872 USD
View
B+
Retailer 8
-
€1,984 EUR
$2,216 USD
View
B
Retailer 9
-
€2,499 EUR
$2,792 USD
View
B
Retailer 10
-
€2,598 EUR
SGD 3,922 SGD
View
B
Retailer 11
-
€2,663 EUR
$2,975 USD
View
B
Retailer 12
-
€3,049 EUR
£2,682 GBP
View
B
Retailer 13
-
€3,688 EUR
$4,120 USD
View
Most Expensive
Rare Carat
NGB-18-78 · Oct 21
€3,912 EUR
$4,370 USD
View
Price last confirmed 10 days ago
13 more retailers have this diamond
Prices start from €745 EURSave up to €2,943 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.

A
5.21ct Cushion
€745 EUR