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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 $1,184 AUD
$832 USD
As of October 29, 2026
Save $9,890 AUD (89%) vs most expensive(unlock to see where)
14 retailers carry this diamond
Most expensive: $11,074 AUD at Brilliant Earth · As of October 29, 2026
View at Brilliant Earth

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 prices from $1,184 to $11,074, a $9,890 spread on the same certified stone. Brilliant Earth lists it at $11,074. 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

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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: $11,074 AUD|Low: $844 AUD|High: $11,430 AUD|Avg: $3,710 AUD|-3.1%
Brilliant Earth
Retailer 2
Retailer 3
Retailer 4
Retailer 5
Retailer 6
Retailer 7
Retailer 8
Retailer 9
Retailer 10
Retailer 11
Retailer 12
October 29, 2026
Retailer 11$1,184 AUD
Retailer 9$1,480 AUD
Retailer 12$1,822 AUD
Retailer 5$1,874 AUD
Retailer 2$1,971 AUD
Retailer 8$2,665 AUD
Retailer 3$3,154 AUD
Retailer 4$3,974 AUD
Retailer 10$4,131 AUD
Retailer 6$4,848 AUD
Retailer 7$6,220 AUD
Brilliant Earth$11,074 AUD

39 data points across 12 retailers

14 retailers$1,184 AUD to $11,074 AUD

A
Cheapest Retailer
-
$1,184 AUD
$832 USD
Final sale: no returns
A
Retailer 2
-
$1,421 AUD
HK$7,800 HKD
View
A
Retailer 3
-
$1,480 AUD
$1,040 USD
View
B+
Retailer 4
-
$1,822 AUD
$1,280 USD
View
A
Retailer 5
-
$1,874 AUD
€1,254 EUR
View
A
Retailer 6
-
$1,971 AUD
£1,090 GBP
View
B+
Retailer 7
-
$2,665 AUD
$1,872 USD
View
B+
Retailer 8
-
$3,154 AUD
$2,216 USD
View
B
Retailer 9
-
$3,974 AUD
$2,792 USD
View
B
Retailer 10
-
$4,131 AUD
SGD 3,922 SGD
View
B
Retailer 11
-
$4,234 AUD
$2,975 USD
View
B
Retailer 12
-
$4,848 AUD
£2,682 GBP
View
Retailer 13
-
$6,220 AUD
$4,370 USD
View
Price last confirmed 8 days ago
Most Expensive
B
Brilliant Earth
20387105A · Oct 29
$11,074 AUD
$7,780 USD
View
13 more retailers have this diamond
Prices start from $1,184 AUDSave up to $9,890 AUD

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
$1,184 AUD