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Cushion|Lab Grown|IGI

1.88ct D FL Cushion Lab Grown Diamond

ID • D/FL • IGI LG811638305

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

Certificate IGI LG811638305

Diamond specifications and retailer prices

From £560 GBP
$751 USD
As of October 30, 2026
Save £2,582 GBP (82%) vs most expensive(unlock to see where)
19 retailers carry this diamond
Most expensive: £4,650 GBP at Brilliant Earth · As of September 28, 2026
View at Brilliant Earth

About this 1.88ct lab-grown cushion diamond

This 1.88ct 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 LG811638305 or 811638305. Listed at 19 retailers as of October 30, 2026, with a 461% spread between the cheapest and most expensive listing. That is exactly the kind of price-discovery gap Carat Hunter was built to surface. Compare the cross-retailer prices above before buying. The same certified stone often varies 15 to 40% across stores.

The 4Cs

1.88
Carat
D
Colour
FL
Clarity
Ideal
Cut

Specifications

CutIdeal
PolishExcellent
SymmetryExcellent
FluorescenceNone
Crown angle34.7°
Pavilion angle36.6°
OriginLab Grown
Grading LabIGI
CertificateIGI LG811638305
Dimensions7.11 × 7.01 × 4.60 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
7.11 mm7.01 mm1.88 ctD / FL
OriginLab Grown
CutIdeal
PolishExcellent
SymmetryExcellent
FluorescenceNone
CertificateIGI LG811638305
Side View
Table 62.0%Crown 34.7°Girdle: MED-STKPavilion 36.6°Culet: NoneDepth 65.6%

Caratlytics Score

How it works →
A+
Exceptional
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: £3,142 GBP|Low: £514 GBP|High: £4,493 GBP|Avg: £1,680 GBP|-30.1%
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
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Retailer 16
Retailer 17
October 31, 2026
Retailer 15£560 GBP
Retailer 9£562 GBP
Retailer 10£664 GBP
Retailer 16£874 GBP
Retailer 2£893 GBP
Retailer 12£962 GBP
Retailer 14£980 GBP
Retailer 17£1,200 GBP
Retailer 6£1,234 GBP
Retailer 5£1,661 GBP
Retailer 3£1,843 GBP
Retailer 11£1,947 GBP
Retailer 7£2,027 GBP
Retailer 13£2,489 GBP
Retailer 8£2,720 GBP
Retailer 4£2,857 GBP
Brilliant Earth£3,142 GBP

27 data points across 17 retailers

19 retailers£560 GBP to £3,142 GBP

A+
Cheapest Retailer
-
£560 GBP
$751 USD
Final sale: no returns
Retailer 2
-
£562 GBP
$753 USD
View
Price last confirmed 14 days ago
A
Retailer 3
-
£664 GBP
$890 USD
View
A
Retailer 4
-
£874 GBP
$1,171 USD
View
A
Retailer 5
-
£893 GBP
View
A
Retailer 6
-
£962 GBP
€1,227 EUR
View
A
Retailer 7
-
£980 GBP
ZAR 21,214 ZAR
View
A
Retailer 8
-
£1,200 GBP
$1,608 USD
View
A
Retailer 9
-
£1,234 GBP
$1,654 USD
View
B+
Retailer 10
-
£1,661 GBP
View
B+
Retailer 11
-
£1,747 GBP
$2,341 USD
View
B+
Retailer 12
-
£1,843 GBP
$2,469 USD
View
B+
Retailer 13
-
£1,947 GBP
$2,609 USD
View
B+
Retailer 14
-
£2,027 GBP
SGD 3,670 SGD
View
B+
Retailer 15
-
£2,489 GBP
View
Retailer 16
-
£2,720 GBP
$3,645 USD
View
Price last confirmed 9 days ago
B+
Retailer 17
-
£2,857 GBP
$3,828 USD
View
B
Retailer 18
-
£3,142 GBP
$4,210 USD
View
Most Expensive
Brilliant Earth
20988015A · Sep 28
£4,650 GBP
$6,230 USD
View
Price last confirmed 32 days ago
18 more retailers have this diamond
Prices start from £560 GBPSave up to £2,582 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+
1.88ct Cushion
£560 GBP