CaratHunter
Plans
Cushion|Lab Grown|IGI

1.51ct E SI1 Cushion Lab Grown Diamond

ID • E/SI1 • IGI LG519231898

Shape and cutting style on the report: Square cushion brilliant

Certificate IGI LG519231898

Diamond specifications and retailer prices

From £155 GBP
As of November 6, 2026
Save £703 GBP (82%) vs most expensive(unlock to see where)
13 retailers carry this diamond
Most expensive: £858 GBP at Reve Diamonds · As of November 6, 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 E colour (colourless) and SI1 clarity (slightly-included), with a top-tier cut grade and certified by IGI LG519231898 or 519231898. Listed at 13 retailers as of November 6, 2026, with prices from £155 to £858, a £703 spread on the same certified stone. Reve Diamonds lists it at £858. 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

1.51
Carat
E
Colour
SI1
Clarity
Ideal
Cut

Specifications

CutIdeal
PolishExcellent
SymmetryExcellent
FluorescenceNone
Crown angle33°
Pavilion angle33.6°
OriginLab Grown
Grading LabIGI
CertificateIGI LG519231898
Dimensions6.71 × 6.64 × 4.00 mm
L/W Ratio1.01
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
6.71 mm6.64 mm1.51 ctE / SI1
OriginLab Grown
CutIdeal
PolishExcellent
SymmetryExcellent
FluorescenceNone
CertificateIGI LG519231898
Side View
Table 62.5%Crown 33°Girdle: MED-THKPavilion 33.6°Culet: NoneDepth 60.2%

Caratlytics Score

How it works →
A
Excellent
Excellent quality and great value
Unlock full score analysis
See the detailed 0 to 100 score with Quality, Value, Certification & Market breakdown

Price History

Last verified: Nov 6
Current: £306 GBP|Low: £155 GBP|High: £829 GBP|Avg: £390 GBP|+3.0%
Retailer 1
Retailer 2
Retailer 3
Retailer 4
Retailer 5
Retailer 6
Retailer 7
Retailer 8
Retailer 9
Retailer 10
November 5, 2026
Retailer 10£155 GBP
Retailer 8£172 GBP
Retailer 7£232 GBP
Retailer 4£283 GBP
Retailer 1£306 GBP
Retailer 2£342 GBP
Retailer 5£409 GBP
Retailer 9£421 GBP
Retailer 6£680 GBP
Retailer 3£804 GBP

42 data points across 10 retailers

13 retailers£155 GBP to £858 GBP

A
Cheapest Retailer
-
£155 GBP
Final sale: no returns
Retailer 2
-
£172 GBP
View
Price last confirmed 12 days ago
B+
Retailer 3
-
£232 GBP
View
A
Retailer 4
-
£283 GBP
View
A
Retailer 5
-
£306 GBP
View
A
Retailer 6
-
£335 GBP
View
A
Retailer 7
-
£342 GBP
View
A
Retailer 8
-
£409 GBP
View
B+
Retailer 9
-
£421 GBP
View
B+
Retailer 10
-
£593 GBP
View
B+
Retailer 11
-
£680 GBP
View
B
Retailer 12
-
£804 GBP
View
Most Expensive
B
Reve Diamonds
51A9E8EA3 · Nov 6
£858 GBP
$1,148 USD
View
12 more retailers have this diamond
Prices start from £155 GBPSave up to £703 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
£155 GBP