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Cushion|Lab Grown|IGI

1.58ct G SI1 Cushion Lab Grown Diamond

ID • G/SI1 • IGI LG583324122

Shape and cutting style on the report: Cushion brilliant

Certificate IGI LG583324122

Diamond specifications and retailer prices

From £147 GBP
$197 USD
As of October 30, 2026
Save £637 GBP (81%) vs most expensive(unlock to see where)
9 retailers carry this diamond
Most expensive: £784 GBP at Brilliant Earth · As of October 31, 2026
View at Brilliant Earth

About this 1.58ct lab-grown cushion diamond

This 1.58ct 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 top-tier cut grade and certified by IGI LG583324122 or 583324122. Listed at 9 retailers as of October 30, 2026, with prices from £147 to £784, a £637 spread on the same certified stone. Brilliant Earth lists it at £784. 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

1.58
Carat
G
Colour
SI1
Clarity
Ideal
Cut

Specifications

CutIdeal
PolishExcellent
SymmetryExcellent
FluorescenceNone
Crown angle30.9°
Pavilion angle40.5°
OriginLab Grown
Grading LabIGI
CertificateIGI LG583324122
Dimensions7.94 × 6.39 × 4.21 mm
L/W Ratio1.24
Girdle conditionFaceted
Culet sizePointed
Top View
7.94 mm6.39 mm1.58 ctG / SI1
OriginLab Grown
CutIdeal
PolishExcellent
SymmetryExcellent
FluorescenceNone
CertificateIGI LG583324122
Side View
Table 66.0%Crown 30.9°Girdle: THN-STKPavilion 40.5°Culet: NoneDepth 65.9%

Caratlytics Score

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A
Excellent
Excellent quality and great value
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Price History

Last verified: Oct 30
Current: £784 GBP|Low: £107 GBP|High: £806 GBP|Avg: £395 GBP|-2.8%
Brilliant Earth
Retailer 2
Retailer 3
Retailer 4
Retailer 5
Retailer 6
Retailer 7
Retailer 8
Retailer 9
November 1, 2026
Retailer 7£147 GBP
Retailer 5£163 GBP
Retailer 3£286 GBP
Retailer 6£290 GBP
Retailer 2£292 GBP
Retailer 9£378 GBP
Retailer 8£415 GBP
Retailer 4£762 GBP
Brilliant Earth£784 GBP

36 data points across 9 retailers

9 retailers£147 GBP to £784 GBP

A
Cheapest Retailer
-
£147 GBP
$197 USD
Final sale: no returns
Retailer 2
-
£163 GBP
$218 USD
View
Price last confirmed 20 days ago
A
Retailer 3
-
£286 GBP
€365 EUR
View
B+
Retailer 4
-
£290 GBP
$388 USD
View
A
Retailer 5
-
£292 GBP
View
A
Retailer 6
-
£378 GBP
$507 USD
View
A
Retailer 7
-
£415 GBP
$556 USD
View
Retailer 8
-
£762 GBP
View
Price last confirmed 7 days ago
Most Expensive
B
Brilliant Earth
9857590A · Oct 31
£784 GBP
$1,050 USD
View
8 more retailers have this diamond
Prices start from £147 GBPSave up to £637 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
1.58ct Cushion
£147 GBP