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Cushion|Lab Grown|IGI

1.51ct F SI1 Cushion Lab Grown Diamond

VG • F/SI1 • IGI LG774618688

Shape and cutting style on the report: Cushion modified brilliant

Certificate IGI LG774618688

Diamond specifications and retailer prices

From £240 GBP
$322 USD
As of November 1, 2026
Save £591 GBP (71%) vs most expensive(unlock to see where)
14 retailers carry this diamond
Most expensive: £871 GBP at Reve Diamonds · As of October 25, 2026
View at Reve Diamonds

About this 1.51ct lab-grown cushion diamond

This 1.51ct lab-grown cushion sits in the one-and-a-half to two carat band, graded F colour (colourless) and SI1 clarity (slightly-included), with a very-good cut grade and certified by IGI LG774618688 or 774618688. Listed at 14 retailers as of October 26, 2026, with a 246% spread between the cheapest and most expensive listing. That is exactly the kind of price-discovery gap Carat Hunter was built to surface. Cut grade matters more than carat or clarity for visible brilliance. If you can shift budget toward an Excellent or Ideal cut, do it before chasing higher colour or clarity.

The 4Cs

1.51
Carat
F
Colour
SI1
Clarity
Very Good
Cut

Specifications

CutVery Good
PolishExcellent
SymmetryExcellent
FluorescenceNone
Crown angle44.2°
Pavilion angle33.1°
OriginLab Grown
Grading LabIGI
CertificateIGI LG774618688
Dimensions7.18 × 5.56 × 3.94 mm
L/W Ratio1.29
Girdle conditionFaceted
Culet sizePointed
Cert comments
This Laboratory Grown Diamond was created by Chemical Vapor Deposition (CVD) growth process Type IIa
Top View
7.18 mm5.56 mm1.51 ctF / SI1
OriginLab Grown
CutVery Good
PolishExcellent
SymmetryExcellent
FluorescenceNone
CertificateIGI LG774618688
Side View
Table 64.0%Crown 44.2°Girdle: MED-THKPavilion 33.1°Culet: NoneDepth 70.9%

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 1
Current: £444 GBP|Low: £159 GBP|High: £914 GBP|Avg: £483 GBP|-1.3%
Retailer 1
Retailer 2
Retailer 3
Retailer 4
Retailer 5
Retailer 6
Retailer 7
Retailer 8
Retailer 9
Retailer 10
Retailer 11
Retailer 12
Reve Diamonds
November 2, 2026
Retailer 2£159 GBP
Retailer 11£228 GBP
Retailer 3£240 GBP
Retailer 5£297 GBP
Retailer 8£321 GBP
Retailer 6£352 GBP
Retailer 12£426 GBP
Retailer 1£444 GBP
Retailer 4£611 GBP
Retailer 10£626 GBP
Retailer 7£686 GBP
Retailer 9£831 GBP
Reve Diamonds£871 GBP

40 data points across 13 retailers

14 retailers£240 GBP to £831 GBP

Retailer 1
-
£228 GBP
Price last confirmed 16 days ago
B+
Retailer 2
-
£240 GBP
$322 USD
View
A
Retailer 3
-
£297 GBP
€380 EUR
View
A
Retailer 4
-
£321 GBP
View
B+
Retailer 5
-
£352 GBP
$472 USD
View
Retailer 6
-
£426 GBP
$571 USD
View
Price last confirmed 7 days ago
Retailer 7
-
£428 GBP
$575 USD
View
Price last confirmed 20 days ago
B+
Retailer 8
-
£444 GBP
$596 USD
View
B+
Retailer 9
-
£611 GBP
$820 USD
View
B+
Retailer 10
-
£626 GBP
$840 USD
View
Retailer 11
-
£641 GBP
$860 USD
View
Price last confirmed 39 days ago
B
Retailer 12
-
£686 GBP
$920 USD
View
B
Retailer 13
-
£831 GBP
View
Most Expensive
Reve Diamonds
8532F276D · Oct 25
£871 GBP
$1,169 USD
View
Price last confirmed 8 days ago
13 more retailers have this diamond
Prices start from £240 GBPSave up to £591 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
1.51ct Cushion
£240 GBP