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Marquise|Lab Grown|IGI

1.58ct D SI1 Marquise Lab Grown Diamond

ID • D/SI1 • IGI LG803633420

Shape and cutting style on the report: Marquise brilliant

Certificate IGI LG803633420

Diamond specifications and retailer prices

From £229 GBP
As of October 27, 2026
Save £794 GBP (78%) vs most expensive(unlock to see where)
17 retailers carry this diamond
Most expensive: £1,022 GBP at Brilliant Earth · As of October 31, 2026
View at Brilliant Earth

About this 1.58ct lab-grown marquise diamond

This 1.58ct lab-grown marquise sits in the one-and-a-half to two carat band, graded D colour (colourless) and SI1 clarity (slightly-included), with a top-tier cut grade and certified by IGI LG803633420 or 803633420. Listed at 17 retailers as of October 27, 2026, with prices from £229 to £1,022, a £794 spread on the same certified stone. Brilliant Earth lists it at £1,022. 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
D
Colour
SI1
Clarity
Ideal
Cut

Specifications

CutIdeal
PolishExcellent
SymmetryExcellent
FluorescenceNone
Crown angle33.4°
Pavilion angle39.6°
OriginLab Grown
Grading LabIGI
CertificateIGI LG803633420
Dimensions11.79 × 6.18 × 3.80 mm
L/W Ratio1.91
Girdle conditionFaceted
Culet sizePointed
Cert comments
This Laboratory Grown Diamond was created by Chemical Vapor Deposition (CVD) growth process Type IIa
Top View
11.79 mm6.18 mm1.58 ctD / SI1
OriginLab Grown
CutIdeal
PolishExcellent
SymmetryExcellent
FluorescenceNone
CertificateIGI LG803633420
Side View
Table 58.0%Crown 33.4°Girdle: MED-STKPavilion 39.6°Culet: NoneDepth 61.5%

Caratlytics Score

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A
Excellent
Excellent quality and great value
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Price History

Last verified: Oct 27
Current: £1,022 GBP|Low: £158 GBP|High: £1,060 GBP|Avg: £476 GBP|-3.5%
Brilliant Earth
Retailer 2
Retailer 3
Retailer 4
Retailer 5
Retailer 6
Retailer 7
Retailer 8
Retailer 9
Retailer 10
Retailer 11
Retailer 12
Retailer 13
Retailer 14
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Retailer 17
October 31, 2026
Retailer 3£165 GBP
Retailer 4£184 GBP
Retailer 17£192 GBP
Retailer 9£204 GBP
Retailer 11£229 GBP
Retailer 10£331 GBP
Retailer 16£349 GBP
Retailer 12£379 GBP
Retailer 6£396 GBP
Retailer 7£412 GBP
Retailer 2£421 GBP
Retailer 15£534 GBP
Retailer 5£658 GBP
Retailer 8£664 GBP
Retailer 13£822 GBP
Retailer 14£828 GBP
Brilliant Earth£1,022 GBP

41 data points across 17 retailers

17 retailers£229 GBP to £1,022 GBP

Retailer 1
-
£165 GBP
$221 USD
Price last confirmed 9 days ago
Retailer 2
-
£192 GBP
$257 USD
View
Price last confirmed 8 days ago
Retailer 3
-
£204 GBP
$274 USD
View
Price last confirmed 7 days ago
A
Retailer 4
-
£229 GBP
View
A
Retailer 5
-
£229 GBP
HK$2,400 HKD
View
A
Retailer 6
-
£331 GBP
€422 EUR
View
Retailer 7
-
£349 GBP
$468 USD
View
Price last confirmed 7 days ago
A
Retailer 8
-
£379 GBP
View
A
Retailer 9
-
£396 GBP
$531 USD
View
A
Retailer 10
-
£412 GBP
$552 USD
View
B+
Retailer 11
-
£421 GBP
A$868 AUD
View
B+
Retailer 12
-
£534 GBP
$715 USD
View
Retailer 13
-
£658 GBP
$882 USD
View
Price last confirmed 7 days ago
B+
Retailer 14
-
£664 GBP
SGD 1,202 SGD
View
Retailer 15
-
£822 GBP
View
Price last confirmed 7 days ago
B
Retailer 16
-
£828 GBP
$1,110 USD
View
Most Expensive
B
Brilliant Earth
19868126A · Oct 31
£1,022 GBP
$1,370 USD
View
16 more retailers have this diamond
Prices start from £229 GBPSave up to £794 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 Marquise
£229 GBP