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Cushion|Lab Grown|IGI

1.28ct D FL Cushion Lab Grown Diamond

ID • D/FL • IGI LG783648800

Shape and cutting style on the report: Cushion modified brilliant

Certificate IGI LG783648800

Diamond specifications and retailer prices

From £831 GBP
$1,115 USD
As of October 31, 2026
Save £935 GBP (53%) vs most expensive(unlock to see where)
4 retailers carry this diamond
Most expensive: £1,766 GBP at Brilliant Earth · As of October 31, 2026
View at Brilliant Earth

About this 1.28ct lab-grown cushion diamond

This 1.28ct lab-grown cushion sits in the one-and-a-quarter to one-and-a-half carat band, graded D colour (colourless) and FL clarity (flawless or internally-flawless), with a top-tier cut grade and certified by IGI LG783648800 or 783648800. Listed at 4 retailers as of October 31, 2026, with prices from £831 to £1,766, a £935 spread on the same certified stone. Brilliant Earth lists it at £1,766. Compare the cross-retailer prices above before buying. The same certified stone often varies 15 to 40% across stores.

The 4Cs

1.28
Carat
D
Colour
FL
Clarity
Ideal
Cut

Specifications

CutIdeal
PolishExcellent
SymmetryExcellent
FluorescenceNone
Crown angle36.3°
Pavilion angle33.7°
OriginLab Grown
Grading LabIGI
CertificateIGI LG783648800
Dimensions8.12 × 5.54 × 3.47 mm
L/W Ratio1.47
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
8.12 mm5.54 mm1.28 ctD / FL
OriginLab Grown
CutIdeal
PolishExcellent
SymmetryExcellent
FluorescenceNone
CertificateIGI LG783648800
Side View
Table 60.0%Crown 36.3°Girdle: THN-STKPavilion 33.7°Culet: NoneDepth 62.6%

Caratlytics Score

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B+
Very Good
Strong quality and value balance
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See the detailed 0 to 100 score with Quality, Value, Certification & Market breakdown

Price History

Last verified: Oct 31
Current: £1,766 GBP|Low: £533 GBP|High: £2,534 GBP|Avg: £1,374 GBP|-30.3%
Brilliant Earth
Retailer 2
Retailer 3
Retailer 4
Retailer 5
Retailer 6
Retailer 7
Retailer 8
Retailer 9
Retailer 10
Retailer 11
Retailer 12
October 31, 2026
Retailer 5£533 GBP
Retailer 2£831 GBP
Retailer 8£861 GBP
Retailer 11£1,069 GBP
Retailer 4£1,074 GBP
Retailer 10£1,110 GBP
Retailer 9£1,116 GBP
Retailer 12£1,269 GBP
Retailer 6£1,452 GBP
Brilliant Earth£1,766 GBP
Retailer 7£2,385 GBP
Retailer 3£2,394 GBP

16 data points across 12 retailers

4 retailers£831 GBP to £1,766 GBP

Retailer 1
-
£533 GBP
$715 USD
Price last confirmed 21 days ago
B+
Retailer 2
-
£831 GBP
$1,115 USD
View
Retailer 3
-
£1,452 GBP
View
Price last confirmed 22 days ago
Most Expensive
B
Brilliant Earth
21401971Y · Oct 31
£1,766 GBP
$2,370 USD
View
3 more retailers have this diamond
Prices start from £831 GBPSave up to £935 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.

B+
1.28ct Cushion
£831 GBP