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Cushion|Lab Grown|IGI

1.28ct D FL Cushion Lab Grown Diamond

ID • D/FL • IGI LG790683937

Shape and cutting style on the report: Antique cushion cut

Certificate IGI LG790683937

Diamond specifications and retailer prices

From £885 GBP
$1,187 USD
As of November 1, 2026
Save £2,710 GBP (75%) vs most expensive(unlock to see where)
13 retailers carry this diamond
Most expensive: £3,595 GBP at Taylor and Hart · As of October 31, 2026
View at Taylor and Hart

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 LG790683937 or 790683937. Listed at 13 retailers as of October 31, 2026, with prices from £885 to £3,595, a £2,710 spread on the same certified stone. Taylor and Hart lists it at £3,595. 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 angle37.4°
Pavilion angle38.5°
OriginLab Grown
Grading LabIGI
CertificateIGI LG790683937
Dimensions7.82 × 5.78 × 3.53 mm
L/W Ratio1.35
Girdle conditionFaceted
Culet sizeLarge
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
7.82 mm5.78 mm1.28 ctD / FL
OriginLab Grown
CutIdeal
PolishExcellent
SymmetryExcellent
FluorescenceNone
CertificateIGI LG790683937
Side View
Table 58.0%Crown 37.4°Girdle: MED-THKPavilion 38.5°Culet: LargeDepth 61.1%

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: Nov 1
Current: £1,070 GBP|Low: £850 GBP|High: £3,342 GBP|Avg: £1,560 GBP
Retailer 1
Retailer 2
Retailer 3
Retailer 4
Retailer 5
Retailer 6
Retailer 7
Retailer 8
Retailer 9
Retailer 10
Retailer 11
Retailer 12
November 3, 2026
Retailer 9£885 GBP
Retailer 3£963 GBP
Retailer 2£1,026 GBP
Retailer 10£1,026 GBP
Retailer 1£1,070 GBP
Retailer 7£1,155 GBP
Retailer 8£1,468 GBP
Retailer 5£1,489 GBP
Retailer 12£1,923 GBP
Retailer 11£1,966 GBP
Retailer 4£2,476 GBP
Retailer 6£3,297 GBP

43 data points across 12 retailers

13 retailers£885 GBP to £3,595 GBP

A
Cheapest Retailer
-
£885 GBP
$1,187 USD
B+
Retailer 2
-
£963 GBP
$1,292 USD
View
Retailer 3
-
£1,026 GBP
$1,377 USD
View
Price last confirmed 21 days ago
B+
Retailer 4
-
£1,026 GBP
$1,377 USD
View
B+
Retailer 5
-
£1,070 GBP
$1,436 USD
View
Final sale: no returns
B+
Retailer 6
-
£1,155 GBP
$1,550 USD
View
B+
Retailer 7
-
£1,468 GBP
$1,970 USD
View
B+
Retailer 8
-
£1,489 GBP
View
B
Retailer 9
-
£1,923 GBP
$2,581 USD
View
B
Retailer 10
-
£1,966 GBP
$2,638 USD
View
B
Retailer 11
-
£2,476 GBP
View
B
Retailer 12
-
£3,297 GBP
View
Most Expensive
B
Taylor and Hart
3KZQ333 · Oct 31
£3,595 GBP
$4,824 USD
View
12 more retailers have this diamond
Prices start from £885 GBPSave up to £2,710 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
1.28ct Cushion
£885 GBP