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Cushion|Lab Grown|IGI

1.59ct G SI1 Cushion Lab Grown Diamond

ID • G/SI1 • IGI LG620424322

Shape and cutting style on the report: Square cushion brilliant

Certificate IGI LG620424322

Diamond specifications and retailer prices

From £198 GBP
$265 USD
As of October 30, 2026
Save £731 GBP (79%) vs most expensive(unlock to see where)
6 retailers carry this diamond
Most expensive: £929 GBP at Michael Trio · As of October 31, 2026
View at Michael Trio

About this 1.59ct lab-grown cushion diamond

This 1.59ct 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 LG620424322 or 620424322. Listed at 6 retailers as of October 30, 2026, with prices from £198 to £929, a £731 spread on the same certified stone. Michael Trio lists it at £929. 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

1.59
Carat
G
Colour
SI1
Clarity
Ideal
Cut

Specifications

CutIdeal
PolishExcellent
SymmetryExcellent
FluorescenceNone
Crown angle34.2°
Pavilion angle40.2°
OriginLab Grown
Grading LabIGI
CertificateIGI LG620424322
Dimensions6.92 × 6.80 × 4.58 mm
L/W Ratio1.02
Girdle conditionFaceted
Culet sizePointed
Cert comments
This Laboratory Grown Diamond was created by Chemical Vapor Deposition (CVD) growth process and may include post-growth treatment Type IIa
Top View
6.92 mm6.80 mm1.59 ctG / SI1
OriginLab Grown
CutIdeal
PolishExcellent
SymmetryExcellent
FluorescenceNone
CertificateIGI LG620424322
Side View
Table 60.0%Crown 34.2°Girdle: THN-STKPavilion 40.2°Culet: NoneDepth 67.4%

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: Oct 30
Current: £929 GBP|Low: £198 GBP|High: £929 GBP|Avg: £530 GBP
Michael Trio
Retailer 2
Retailer 3
Retailer 4
Retailer 5
Retailer 6
October 30, 2026
Retailer 4£198 GBP
Retailer 5£317 GBP
Retailer 6£325 GBP
Retailer 3£601 GBP
Retailer 2£784 GBP
Michael Trio£929 GBP

4 data points across 6 retailers

6 retailers£198 GBP to £929 GBP

A
Cheapest Retailer
-
£198 GBP
$265 USD
Final sale: no returns
A
Retailer 2
-
£317 GBP
$425 USD
View
A
Retailer 3
-
£325 GBP
HK$3,400 HKD
View
Retailer 4
-
£601 GBP
$805 USD
View
Price last confirmed 11 days ago
B+
Retailer 5
-
£784 GBP
$1,050 USD
View
Most Expensive
B
Michael Trio
3292028890 · Oct 31
£929 GBP
SGD 1,682 SGD
View
5 more retailers have this diamond
Prices start from £198 GBPSave up to £731 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
1.59ct Cushion
£198 GBP