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Cushion|Lab Grown|IGI

1.66ct E IF Cushion Lab Grown Diamond

ID • E/IF • IGI LG729569332

Shape and cutting style on the report: Cushion modified brilliant

Certificate IGI LG729569332

Diamond specifications and retailer prices

From £525 GBP
$704 USD
As of November 1, 2026
Save £1,930 GBP (79%) vs most expensive(unlock to see where)
20 retailers carry this diamond
Most expensive: £2,455 GBP at Brilliant Earth · As of October 31, 2026
View at Brilliant Earth

About this 1.66ct lab-grown cushion diamond

This 1.66ct lab-grown cushion sits in the one-and-a-half to two carat band, graded E colour (colourless) and IF clarity (flawless or internally-flawless), with a top-tier cut grade and certified by IGI LG729569332 or 729569332. Listed at 20 retailers as of October 31, 2026, with prices from £525 to £2,455, a £1,930 spread on the same certified stone. Brilliant Earth lists it at £2,455. Compare the cross-retailer prices above before buying. The same certified stone often varies 15 to 40% across stores.

The 4Cs

1.66
Carat
E
Colour
IF
Clarity
Ideal
Cut

Specifications

CutIdeal
PolishExcellent
SymmetryExcellent
FluorescenceNone
Crown angle35.8°
Pavilion angle40°
OriginLab Grown
Grading LabIGI
CertificateIGI LG729569332
Dimensions7.93 × 6.21 × 4.31 mm
L/W Ratio1.28
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
7.93 mm6.21 mm1.66 ctE / IF
OriginLab Grown
CutIdeal
PolishExcellent
SymmetryExcellent
FluorescenceNone
CertificateIGI LG729569332
Side View
Table 58.0%Crown 35.8°Girdle: MED-VTKPavilion 40°Culet: NoneDepth 69.4%

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: Nov 1
Current: £2,455 GBP|Low: £525 GBP|High: £2,508 GBP|Avg: £1,260 GBP|-2.1%
Brilliant Earth
Retailer 2
Retailer 3
Retailer 4
Retailer 5
Retailer 6
Retailer 7
Retailer 8
Retailer 9
Retailer 10
Retailer 11
Retailer 12
Retailer 13
Retailer 14
Retailer 15
Retailer 16
November 1, 2026
Retailer 11£525 GBP
Retailer 4£546 GBP
Retailer 16£672 GBP
Retailer 7£733 GBP
Retailer 8£782 GBP
Retailer 10£886 GBP
Retailer 9£906 GBP
Retailer 14£1,002 GBP
Retailer 12£1,240 GBP
Retailer 13£1,358 GBP
Retailer 15£1,414 GBP
Retailer 6£1,695 GBP
Retailer 3£1,758 GBP
Retailer 5£1,840 GBP
Retailer 2£2,298 GBP
Brilliant Earth£2,455 GBP

43 data points across 16 retailers

20 retailers£525 GBP to £2,455 GBP

A
Cheapest Retailer
-
£525 GBP
$704 USD
Final sale: no returns
Retailer 2
-
£546 GBP
$731 USD
View
Price last confirmed 16 days ago
A
Retailer 3
-
£640 GBP
HK$6,700 HKD
View
A
Retailer 4
-
£672 GBP
$900 USD
View
A
Retailer 5
-
£733 GBP
$982 USD
View
A
Retailer 6
-
£782 GBP
$1,048 USD
View
A
Retailer 7
-
£886 GBP
€1,130 EUR
View
A
Retailer 8
-
£906 GBP
View
A
Retailer 9
-
£983 GBP
$1,317 USD
View
A
Retailer 10
-
£1,002 GBP
ZAR 21,689 ZAR
View
B+
Retailer 11
-
£1,240 GBP
$1,662 USD
View
B+
Retailer 12
-
£1,358 GBP
A$2,799 AUD
View
Retailer 13
-
£1,414 GBP
$1,895 USD
View
Price last confirmed 11 days ago
B+
Retailer 14
-
£1,695 GBP
View
B+
Retailer 15
-
£1,758 GBP
$2,355 USD
View
B+
Retailer 16
-
£1,840 GBP
SGD 3,332 SGD
View
B
Retailer 17
-
£1,882 GBP
$2,522 USD
View
B
Retailer 18
-
£1,915 GBP
$2,566 USD
View
B
Retailer 19
-
£2,298 GBP
View
Most Expensive
B
Brilliant Earth
15964172A · Oct 31
£2,455 GBP
$3,290 USD
View
19 more retailers have this diamond
Prices start from £525 GBPSave up to £1,930 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
1.66ct Cushion
£525 GBP