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Cushion|Lab Grown|IGI

1.28ct D VVS1 Cushion Lab Grown Diamond

ID • D/VVS1 • IGI LG786634346

Shape and cutting style on the report: Antique cushion cut

Certificate IGI LG786634346

Diamond specifications and retailer prices

From £307 GBP
As of November 4, 2026
Save £1,091 GBP (78%) vs most expensive(unlock to see where)
18 retailers carry this diamond
Most expensive: £1,618 GBP at Queensmith · As of October 27, 2026
View at Queensmith

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 VVS1 clarity (very-very-slightly-included), with a top-tier cut grade and certified by IGI LG786634346 or 786634346. Listed at 18 retailers as of November 3, 2026, with a 356% 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

1.28
Carat
D
Colour
VVS1
Clarity
Ideal
Cut

Specifications

CutIdeal
PolishExcellent
SymmetryExcellent
FluorescenceNone
Crown angle34.5°
Pavilion angle40.8°
OriginLab Grown
Grading LabIGI
CertificateIGI LG786634346
Dimensions7.01 × 6.41 × 3.88 mm
L/W Ratio1.09
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
7.01 mm6.41 mm1.28 ctD / VVS1
OriginLab Grown
CutIdeal
PolishExcellent
SymmetryExcellent
FluorescenceNone
CertificateIGI LG786634346
Side View
Table 53.0%Crown 34.5°Girdle: MED-STKPavilion 40.8°Culet: LargeDepth 60.5%

Caratlytics Score

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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 4
Current: £620 GBP|Low: £295 GBP|High: £1,415 GBP|Avg: £726 GBP|+1.6%
Retailer 1
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
November 4, 2026
Retailer 11£307 GBP
Retailer 12£343 GBP
Retailer 5£344 GBP
Retailer 3£381 GBP
Retailer 14£381 GBP
Retailer 9£489 GBP
Retailer 13£511 GBP
Retailer 1£620 GBP
Retailer 8£927 GBP
Retailer 10£1,067 GBP
Retailer 6£1,106 GBP
Retailer 4£1,210 GBP
Retailer 2£1,224 GBP
Retailer 7£1,398 GBP

44 data points across 14 retailers

18 retailers£307 GBP to £1,398 GBP

A
Cheapest Retailer
-
£307 GBP
A
Retailer 2
-
£343 GBP
View
Final sale: no returns
A
Retailer 3
-
£344 GBP
View
A
Retailer 4
-
£381 GBP
View
Retailer 5
-
£381 GBP
View
Price last confirmed 11 days ago
B+
Retailer 6
-
£489 GBP
View
B+
Retailer 7
-
£511 GBP
View
B+
Retailer 8
-
£528 GBP
View
B+
Retailer 9
-
£620 GBP
View
B
Retailer 10
-
£927 GBP
View
B
Retailer 11
-
£1,067 GBP
View
B
Retailer 12
-
£1,106 GBP
View
B
Retailer 13
-
£1,210 GBP
View
B
Retailer 14
-
£1,224 GBP
View
B
Retailer 15
-
£1,249 GBP
View
B
Retailer 16
-
£1,390 GBP
View
B
Retailer 17
-
£1,398 GBP
View
Most Expensive
Queensmith
LG786634346 · Oct 27
£1,618 GBP
View
Price last confirmed 8 days ago
17 more retailers have this diamond
Prices start from £307 GBPSave up to £1,091 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
£307 GBP