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Cushion|Lab Grown|IGI

2.51ct E SI1 Cushion Lab Grown Diamond

ID • E/SI1 • IGI LG727547270

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

Certificate IGI LG727547270

Diamond specifications and retailer prices

From £258 GBP
HK$2,700 HKD
As of October 30, 2026
Save £1,414 GBP (85%) vs most expensive(unlock to see where)
15 retailers carry this diamond
Most expensive: £1,672 GBP at Brilliant Earth · As of October 29, 2026
View at Brilliant Earth

About this 2.51ct lab-grown cushion diamond

This 2.51ct lab-grown cushion sits in the two to three carat band, graded E colour (colourless) and SI1 clarity (slightly-included), with a top-tier cut grade and certified by IGI LG727547270 or 727547270. Listed at 15 retailers as of October 29, 2026, with prices from £258 to £1,672, a £1,414 spread on the same certified stone. Brilliant Earth lists it at £1,672. 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

2.51
Carat
E
Colour
SI1
Clarity
Ideal
Cut

Specifications

CutIdeal
PolishExcellent
SymmetryExcellent
FluorescenceNone
Crown angle35.6°
Pavilion angle32.2°
OriginLab Grown
Grading LabIGI
CertificateIGI LG727547270
Dimensions7.94 × 7.60 × 4.76 mm
L/W Ratio1.04
Girdle conditionFaceted
Culet sizePointed
Cert comments
This Laboratory Grown Diamond was created by Chemical Vapor Deposition (CVD) growth process Type IIa
Top View
7.94 mm7.60 mm2.51 ctE / SI1
OriginLab Grown
CutIdeal
PolishExcellent
SymmetryExcellent
FluorescenceNone
CertificateIGI LG727547270
Side View
Table 61.0%Crown 35.6°Girdle: MED-STKPavilion 32.2°Culet: NoneDepth 62.6%

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 30
Current: £1,672 GBP|Low: £213 GBP|High: £1,672 GBP|Avg: £623 GBP
Brilliant Earth
Retailer 2
Retailer 3
Retailer 4
Retailer 5
Retailer 6
Retailer 7
Retailer 8
Retailer 9
Retailer 10
Retailer 11
Retailer 12
Retailer 13
Retailer 14
Retailer 15
October 31, 2026
Retailer 7£213 GBP
Retailer 9£258 GBP
Retailer 14£297 GBP
Retailer 15£355 GBP
Retailer 8£373 GBP
Retailer 4£394 GBP
Retailer 11£448 GBP
Retailer 6£463 GBP
Retailer 2£465 GBP
Retailer 5£590 GBP
Retailer 3£599 GBP
Retailer 10£751 GBP
Retailer 12£949 GBP
Retailer 13£1,287 GBP
Brilliant Earth£1,672 GBP

42 data points across 15 retailers

15 retailers£258 GBP to £1,672 GBP

A
Cheapest Retailer
-
£258 GBP
HK$2,700 HKD
Retailer 2
-
£297 GBP
View
Price last confirmed 13 days ago
A
Retailer 3
-
£355 GBP
$475 USD
View
A
Retailer 4
-
£373 GBP
€476 EUR
View
B+
Retailer 5
-
£394 GBP
$528 USD
View
A
Retailer 6
-
£448 GBP
View
A
Retailer 7
-
£463 GBP
$620 USD
View
A
Retailer 8
-
£465 GBP
A$958 AUD
View
A
Retailer 9
-
£590 GBP
$790 USD
View
B+
Retailer 10
-
£599 GBP
$803 USD
View
B+
Retailer 11
-
£751 GBP
SGD 1,359 SGD
View
B+
Retailer 12
-
£949 GBP
View
B
Retailer 13
-
£1,246 GBP
$1,670 USD
View
Retailer 14
-
£1,287 GBP
$1,725 USD
View
Price last confirmed 12 days ago
Most Expensive
B
Brilliant Earth
16747996A · Oct 29
£1,672 GBP
$2,240 USD
View
14 more retailers have this diamond
Prices start from £258 GBPSave up to £1,414 GBP

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
2.51ct Cushion
£258 GBP