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Cushion|Lab Grown|IGI

1.51ct G SI1 Cushion Lab Grown Diamond

VG • G/SI1 • IGI LG520298323

Shape and cutting style on the report: Square cushion modified brilliant

Certificate IGI LG520298323

Diamond specifications and retailer prices

From £285 GBP
$382 USD
As of November 1, 2026
Save £1,469 GBP (84%) vs most expensive(unlock to see where)
8 retailers carry this diamond
Most expensive: £1,754 GBP at Do Amore Diamonds · As of November 1, 2026
View at Do Amore 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 G colour (near-colourless) and SI1 clarity (slightly-included), with a very-good cut grade and certified by IGI LG520298323 or 520298323. Listed at 8 retailers as of November 1, 2026, with prices from £285 to £1,754, a £1,469 spread on the same certified stone. Do Amore Diamonds lists it at £1,754. 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
G
Colour
SI1
Clarity
Very Good
Cut

Specifications

CutVery Good
PolishExcellent
SymmetryExcellent
FluorescenceNone
Crown angle35°
Pavilion angle40.4°
OriginLab Grown
Grading LabIGI
CertificateIGI LG520298323
Dimensions6.54 × 6.47 × 4.52 mm
L/W Ratio1.01
Girdle conditionFaceted
Culet sizePointed
Top View
6.54 mm6.47 mm1.51 ctG / SI1
OriginLab Grown
CutVery Good
PolishExcellent
SymmetryExcellent
FluorescenceNone
CertificateIGI LG520298323
Side View
Table 62.5%Crown 35°Girdle: STK-VTKPavilion 40.4°Culet: NoneDepth 69.9%

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 1
Current: £1,754 GBP|Low: £285 GBP|High: £1,754 GBP|Avg: £657 GBP
Do Amore Diamonds
Retailer 2
Retailer 3
Retailer 4
Retailer 5
Retailer 6
Retailer 7
Retailer 8
November 2, 2026
Retailer 3£285 GBP
Retailer 5£379 GBP
Retailer 2£438 GBP
Retailer 6£586 GBP
Retailer 7£618 GBP
Retailer 8£793 GBP
Retailer 4£1,006 GBP
Do Amore Diamonds£1,754 GBP

36 data points across 8 retailers

8 retailers£285 GBP to £1,754 GBP

A
Cheapest Retailer
-
£285 GBP
$382 USD
B+
Retailer 2
-
£379 GBP
$508 USD
View
B+
Retailer 3
-
£438 GBP
View
B+
Retailer 4
-
£586 GBP
$785 USD
View
B+
Retailer 5
-
£618 GBP
$829 USD
View
B
Retailer 6
-
£793 GBP
$1,063 USD
View
C
Retailer 7
-
£1,006 GBP
View
Most Expensive
C
Do Amore Diamonds
27-3AE4D1B28 · Nov 1
£1,754 GBP
$2,350 USD
View
7 more retailers have this diamond
Prices start from £285 GBPSave up to £1,469 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
£285 GBP