CaratHunter
Plans
Cushion|Lab Grown|IGI

1.51ct E SI1 Cushion Lab Grown Diamond

ID • E/SI1 • IGI LG529246828

Shape and cutting style on the report: Square cushion brilliant

Certificate IGI LG529246828

Diamond specifications and retailer prices

From £189 GBP
As of November 6, 2026
Save £766 GBP (80%) vs most expensive(unlock to see where)
14 retailers carry this diamond
Most expensive: £955 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 LG529246828 or 529246828. Listed at 14 retailers as of November 6, 2026, with prices from £189 to £955, a £766 spread on the same certified stone. Reve Diamonds lists it at £955. 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 angle36.6°
Pavilion angle35.8°
OriginLab Grown
Grading LabIGI
CertificateIGI LG529246828
Dimensions6.73 × 6.47 × 4.22 mm
L/W Ratio1.04
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
6.73 mm6.47 mm1.51 ctE / SI1
OriginLab Grown
CutIdeal
PolishExcellent
SymmetryExcellent
FluorescenceNone
CertificateIGI LG529246828
Side View
Table 56.5%Crown 36.6°Girdle: MED-THKPavilion 35.8°Culet: NoneDepth 65.2%

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: £445 GBP|Low: £189 GBP|High: £955 GBP|Avg: £472 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
Retailer 13
Reve Diamonds
November 7, 2026
Retailer 4£189 GBP
Retailer 5£210 GBP
Retailer 8£268 GBP
Retailer 13£282 GBP
Retailer 10£335 GBP
Retailer 3£346 GBP
Retailer 9£387 GBP
Retailer 12£398 GBP
Retailer 1£445 GBP
Retailer 2£713 GBP
Retailer 11£717 GBP
Retailer 6£757 GBP
Retailer 7£835 GBP
Reve Diamonds£955 GBP

37 data points across 14 retailers

14 retailers£189 GBP to £955 GBP

A
Cheapest Retailer
-
£189 GBP
Final sale: no returns
A
Retailer 2
-
£210 GBP
View
A
Retailer 3
-
£268 GBP
View
B+
Retailer 4
-
£282 GBP
View
A
Retailer 5
-
£335 GBP
View
A
Retailer 6
-
£346 GBP
View
A
Retailer 7
-
£387 GBP
View
A
Retailer 8
-
£398 GBP
View
B+
Retailer 9
-
£445 GBP
View
B
Retailer 10
-
£713 GBP
View
B
Retailer 11
-
£717 GBP
View
B
Retailer 12
-
£757 GBP
View
B
Retailer 13
-
£835 GBP
View
Most Expensive
B
Reve Diamonds
DC166055E · Nov 6
£955 GBP
$1,278 USD
View
13 more retailers have this diamond
Prices start from £189 GBPSave up to £766 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
£189 GBP