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Cushion|Lab Grown|IGI

1.55ct F SI1 Cushion Lab Grown Diamond

ID • F/SI1 • IGI LG674547147

Shape and cutting style on the report: Square cushion brilliant

Certificate IGI LG674547147

Diamond specifications and retailer prices

From £168 GBP
$225 USD
As of November 1, 2026
Save £726 GBP (81%) vs most expensive(unlock to see where)
15 retailers carry this diamond
Most expensive: £893 GBP at Reve Diamonds · As of November 1, 2026
View at Reve Diamonds

About this 1.55ct lab-grown cushion diamond

This 1.55ct 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 top-tier cut grade and certified by IGI LG674547147 or 674547147. Listed at 15 retailers as of November 1, 2026, with prices from £168 to £893, a £726 spread on the same certified stone. Reve Diamonds lists it at £893. SI-grade stones are eye-clean roughly 60 to 70% of the time at this carat range. Check the inclusion plot on the cert and ask the retailer for high-resolution video before buying.

The 4Cs

1.55
Carat
F
Colour
SI1
Clarity
Ideal
Cut

Specifications

CutIdeal
PolishExcellent
SymmetryExcellent
FluorescenceNone
Crown angle36.1°
Pavilion angle42°
OriginLab Grown
Grading LabIGI
CertificateIGI LG674547147
Dimensions6.81 × 6.48 × 4.48 mm
L/W Ratio1.05
Girdle conditionFaceted
Culet sizePointed
Cert comments
As Grown - No indication of post-growth treatment This Laboratory Grown Diamond was created by Chemical Vapor Deposition (CVD) growth process Type IIa
Top View
6.81 mm6.48 mm1.55 ctF / SI1
OriginLab Grown
CutIdeal
PolishExcellent
SymmetryExcellent
FluorescenceNone
CertificateIGI LG674547147
Side View
Table 62.0%Crown 36.1°Girdle: MED-STKPavilion 42°Culet: NoneDepth 69.1%

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: £487 GBP|Low: £168 GBP|High: £881 GBP|Avg: £453 GBP|+12.0%
Retailer 1
Retailer 2
Retailer 3
Retailer 4
Retailer 5
Retailer 6
Retailer 7
Retailer 8
Retailer 9
Retailer 10
November 2, 2026
Retailer 7£168 GBP
Retailer 9£210 GBP
Retailer 3£238 GBP
Retailer 2£265 GBP
Retailer 5£304 GBP
Retailer 4£342 GBP
Retailer 1£487 GBP
Retailer 10£715 GBP
Retailer 6£723 GBP
Retailer 8£875 GBP

39 data points across 10 retailers

15 retailers£168 GBP to £893 GBP

A
Cheapest Retailer
-
£168 GBP
$225 USD
Final sale: no returns
A
Retailer 2
-
£210 GBP
HK$2,200 HKD
View
A
Retailer 3
-
£238 GBP
View
B+
Retailer 4
-
£265 GBP
$355 USD
View
A
Retailer 5
-
£304 GBP
€389 EUR
View
A
Retailer 6
-
£342 GBP
View
A
Retailer 7
-
£370 GBP
$496 USD
View
B+
Retailer 8
-
£487 GBP
$653 USD
View
B+
Retailer 9
-
£607 GBP
SGD 1,100 SGD
View
B+
Retailer 10
-
£639 GBP
$857 USD
View
B+
Retailer 11
-
£715 GBP
$960 USD
View
B+
Retailer 12
-
£723 GBP
$970 USD
View
Retailer 13
-
£805 GBP
$1,080 USD
View
Price last confirmed 7 days ago
B
Retailer 14
-
£875 GBP
View
Most Expensive
B
Reve Diamonds
EF5D41078 · Nov 1
£893 GBP
$1,199 USD
View
14 more retailers have this diamond
Prices start from £168 GBPSave up to £726 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
1.55ct Cushion
£168 GBP