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Cushion|Lab Grown|IGI

1.09ct E IF Cushion Lab Grown Diamond

ID • E/IF • IGI LG598377011

Shape and cutting style on the report: Cushion brilliant

Certificate IGI LG598377011

Diamond specifications and retailer prices

From £237 GBP
$318 USD
As of October 30, 2026
Save £1,248 GBP (84%) vs most expensive(unlock to see where)
17 retailers carry this diamond
Most expensive: £1,485 GBP at Brilliant Earth · As of October 31, 2026
View at Brilliant Earth

About this 1.09ct lab-grown cushion diamond

This 1.09ct lab-grown cushion sits in the classic one-carat band, graded E colour (colourless) and IF clarity (flawless or internally-flawless), with a top-tier cut grade and certified by IGI LG598377011 or 598377011. Listed at 17 retailers as of October 30, 2026, with prices from £237 to £1,485, a £1,248 spread on the same certified stone. Brilliant Earth lists it at £1,485. Compare the cross-retailer prices above before buying. The same certified stone often varies 15 to 40% across stores.

The 4Cs

1.09
Carat
E
Colour
IF
Clarity
Ideal
Cut

Specifications

CutIdeal
PolishExcellent
SymmetryExcellent
FluorescenceNone
Crown angle33.8°
Pavilion angle40.8°
OriginLab Grown
Grading LabIGI
CertificateIGI LG598377011
Dimensions5.43 × 5.43 × 3.76 mm
L/W Ratio1.00
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
Top View
5.43 mm5.43 mm1.09 ctE / IF
OriginLab Grown
CutIdeal
PolishExcellent
SymmetryExcellent
FluorescenceNone
CertificateIGI LG598377011
Side View
Table 62.0%Crown 33.8°Girdle: MED-STKPavilion 40.8°Culet: NoneDepth 69.2%

Caratlytics Score

How it works →
A
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: Oct 30
Current: £1,485 GBP|Low: £237 GBP|High: £1,537 GBP|Avg: £594 GBP|-3.4%
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
October 31, 2026
Retailer 5£237 GBP
Retailer 4£263 GBP
Retailer 8£279 GBP
Retailer 3£355 GBP
Retailer 7£381 GBP
Retailer 11£452 GBP
Retailer 6£465 GBP
Retailer 2£468 GBP
Retailer 10£640 GBP
Retailer 13£655 GBP
Retailer 12£1,024 GBP
Retailer 9£1,061 GBP
Brilliant Earth£1,485 GBP

42 data points across 13 retailers

17 retailers£237 GBP to £1,485 GBP

A
Cheapest Retailer
-
£237 GBP
$318 USD
Final sale: no returns
A
Retailer 2
-
£263 GBP
$353 USD
View
A
Retailer 3
-
£279 GBP
View
A
Retailer 4
-
£355 GBP
$475 USD
View
A
Retailer 5
-
£381 GBP
$510 USD
View
A
Retailer 6
-
£452 GBP
ZAR 9,788 ZAR
View
A
Retailer 7
-
£465 GBP
View
A
Retailer 8
-
£468 GBP
€597 EUR
View
A
Retailer 9
-
£499 GBP
$669 USD
View
A
Retailer 10
-
£640 GBP
A$1,320 AUD
View
B+
Retailer 11
-
£655 GBP
$877 USD
View
B+
Retailer 12
-
£884 GBP
$1,184 USD
View
B+
Retailer 13
-
£1,024 GBP
View
B+
Retailer 14
-
£1,061 GBP
View
B
Retailer 15
-
£1,092 GBP
$1,463 USD
View
Retailer 16
-
£1,314 GBP
$1,760 USD
View
Price last confirmed 23 days ago
Most Expensive
B
Brilliant Earth
21311968A · Oct 31
£1,485 GBP
$1,990 USD
View
16 more retailers have this diamond
Prices start from £237 GBPSave up to £1,248 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
1.09ct Cushion
£237 GBP