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Cushion|Lab Grown|IGI

1.80ct D FL Cushion Lab Grown Diamond

ID • D/FL • IGI LG840634358

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

Certificate IGI LG840634358

Diamond specifications and retailer prices

From £537 GBP
$719 USD
As of October 30, 2026
Save £2,486 GBP (82%) vs most expensive(unlock to see where)
19 retailers carry this diamond
Most expensive: £3,023 GBP at Brilliant Earth · As of October 31, 2026
View at Brilliant Earth

About this 1.8ct lab-grown cushion diamond

This 1.8ct lab-grown cushion sits in the one-and-a-half to two carat band, graded D colour (colourless) and FL clarity (flawless or internally-flawless), with a top-tier cut grade and certified by IGI LG840634358 or 840634358. Listed at 19 retailers as of October 30, 2026, with prices from £537 to £3,023, a £2,486 spread on the same certified stone. Brilliant Earth lists it at £3,023. Compare the cross-retailer prices above before buying. The same certified stone often varies 15 to 40% across stores.

The 4Cs

1.80
Carat
D
Colour
FL
Clarity
Ideal
Cut

Specifications

CutIdeal
PolishExcellent
SymmetryExcellent
FluorescenceNone
Crown angle36.3°
Pavilion angle38.1°
OriginLab Grown
Grading LabIGI
CertificateIGI LG840634358
Dimensions6.94 × 6.87 × 4.58 mm
L/W Ratio1.01
Girdle conditionFaceted
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
6.94 mm6.87 mm1.80 ctD / FL
OriginLab Grown
CutIdeal
PolishExcellent
SymmetryExcellent
FluorescenceNone
CertificateIGI LG840634358
Side View
Table 62.0%Crown 36.3°Girdle: MED-THKPavilion 38.1°Culet: NoneDepth 66.7%

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 30
Current: £3,023 GBP|Low: £537 GBP|High: £4,299 GBP|Avg: £1,630 GBP|-29.7%
Brilliant Earth
Retailer 2
Retailer 3
Retailer 4
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Retailer 7
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Retailer 11
Retailer 12
Retailer 13
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Retailer 19
November 1, 2026
Retailer 7£537 GBP
Retailer 16£580 GBP
Retailer 19£631 GBP
Retailer 6£713 GBP
Retailer 8£840 GBP
Retailer 2£848 GBP
Retailer 13£936 GBP
Retailer 18£940 GBP
Retailer 3£1,108 GBP
Retailer 14£1,231 GBP
Retailer 12£1,592 GBP
Retailer 4£1,770 GBP
Retailer 15£1,864 GBP
Retailer 9£1,945 GBP
Retailer 17£2,388 GBP
Retailer 11£2,589 GBP
Retailer 10£2,608 GBP
Retailer 5£2,735 GBP
Brilliant Earth£3,023 GBP

17 data points across 19 retailers

19 retailers£537 GBP to £3,023 GBP

A
Cheapest Retailer
-
£537 GBP
$719 USD
Final sale: no returns
A
Retailer 2
-
£580 GBP
View
A
Retailer 3
-
£631 GBP
$845 USD
View
A
Retailer 4
-
£713 GBP
$956 USD
View
A
Retailer 5
-
£840 GBP
$1,126 USD
View
A
Retailer 6
-
£848 GBP
View
A
Retailer 7
-
£936 GBP
€1,195 EUR
View
A
Retailer 8
-
£940 GBP
ZAR 20,352 ZAR
View
A
Retailer 9
-
£1,108 GBP
$1,484 USD
View
A
Retailer 10
-
£1,231 GBP
$1,650 USD
View
B+
Retailer 11
-
£1,592 GBP
View
B+
Retailer 12
-
£1,770 GBP
$2,372 USD
View
B+
Retailer 13
-
£1,864 GBP
$2,498 USD
View
B+
Retailer 14
-
£1,945 GBP
SGD 3,521 SGD
View
B
Retailer 15
-
£2,388 GBP
View
B
Retailer 16
-
£2,589 GBP
$3,469 USD
View
Retailer 17
-
£2,608 GBP
$3,495 USD
View
Price last confirmed 11 days ago
B
Retailer 18
-
£2,735 GBP
$3,665 USD
View
Most Expensive
B
Brilliant Earth
22142712A · Oct 31
£3,023 GBP
$4,050 USD
View
18 more retailers have this diamond
Prices start from £537 GBPSave up to £2,486 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
1.80ct Cushion
£537 GBP