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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 $1,064 SGD
$832 USD
As of October 31, 2026
Save $4,203 SGD (80%) vs most expensive(unlock to see where)
14 retailers carry this diamond
Most expensive: $5,587 SGD 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 31, 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
Colour
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 31
Current: $5,587 SGD|Low: $758 SGD|High: $10,266 SGD|Avg: $3,263 SGD|-0.6%
Rare Carat
Retailer 2
Retailer 3
Retailer 4
Retailer 5
Retailer 6
Retailer 7
Retailer 8
Retailer 9
Retailer 10
November 1, 2026
Retailer 9$1,064 SGD
Retailer 7$1,330 SGD
Retailer 10$1,636 SGD
Retailer 3$1,673 SGD
Retailer 2$1,771 SGD
Retailer 6$2,393 SGD
Retailer 8$3,710 SGD
Retailer 5$4,354 SGD
Retailer 4$5,267 SGD
Rare Carat$5,587 SGD

41 data points across 10 retailers

14 retailers$1,064 SGD to $5,267 SGD

A
Cheapest Retailer
-
$1,064 SGD
$832 USD
Final sale: no returns
A
Retailer 2
-
$1,276 SGD
HK$7,800 HKD
View
A
Retailer 3
-
$1,330 SGD
$1,040 USD
View
B+
Retailer 4
-
$1,636 SGD
$1,280 USD
View
A
Retailer 5
-
$1,673 SGD
€1,246 EUR
View
A
Retailer 6
-
$1,771 SGD
£1,091 GBP
View
B+
Retailer 7
-
$2,393 SGD
$1,872 USD
View
B+
Retailer 8
-
$2,833 SGD
$2,216 USD
View
B
Retailer 9
-
$3,569 SGD
$2,792 USD
View
B
Retailer 10
-
$3,710 SGD
View
B
Retailer 11
-
$3,803 SGD
$2,975 USD
View
B
Retailer 12
-
$4,354 SGD
£2,682 GBP
View
B
Retailer 13
-
$5,267 SGD
$4,120 USD
View
Most Expensive
Rare Carat
NGB-18-78 · Oct 21
$5,587 SGD
$4,370 USD
View
Price last confirmed 10 days ago
13 more retailers have this diamond
Prices start from $1,064 SGDSave up to $4,203 SGD

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
$1,064 SGD