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Marquise|Lab Grown|IGI

1.50ct I SI1 Marquise Lab Grown Diamond

ID • I/SI1 • IGI LG436073791

Shape and cutting style on the report: Marquise brilliant

Certificate IGI LG436073791

Diamond specifications and retailer prices

From £687 GBP
$920 USD
As of October 31, 2026
1 retailer carries this diamond
Only listing: £687 GBP at Brilliant Earth
Only one retailer lists this diamond right now, and it is shown above, so there is nothing to unlock. Similar diamonds are carried by several retailers.
View at Brilliant Earth

About this 1.5ct lab-grown marquise diamond

This 1.5ct lab-grown marquise sits in the one-and-a-half to two carat band, graded I colour (near-colourless) and SI1 clarity (slightly-included), with a top-tier cut grade and certified by IGI LG436073791 or 436073791. Listed at a single retailer as of October 31, 2026. If it later appears at another store, Carat Hunter will surface the price comparison automatically. 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

1.50
Carat
I
Colour
SI1
Clarity
Ideal
Cut

Specifications

CutIdeal
PolishExcellent
SymmetryExcellent
FluorescenceNone
Crown angle36.7°
Pavilion angle41.6°
OriginLab Grown
Grading LabIGI
CertificateIGI LG436073791
Dimensions11.02 × 5.97 × 3.80 mm
L/W Ratio1.85
Girdle conditionFaceted
Culet sizePointed
Cert comments
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Top View
11.02 mm5.97 mm1.50 ctI / SI1
OriginLab Grown
CutIdeal
PolishExcellent
SymmetryExcellent
FluorescenceNone
CertificateIGI LG436073791
Side View
Table 62.0%Crown 36.7°Girdle: UNDPavilion 41.6°Culet: NoneDepth 63.7%

Caratlytics Score

How it works →
B+
Very Good
Strong quality and value balance
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See the detailed 0 to 100 score with Quality, Value, Certification & Market breakdown

Price History

Last verified: Oct 31
Current: £687 GBP|Low: £687 GBP|High: £3,212 GBP|Avg: £1,708 GBP|-30.8%
Brilliant Earth
Retailer 2
Retailer 3
Retailer 4
Retailer 5
Retailer 6
Retailer 7
Retailer 8
October 30, 2026
Brilliant Earth£687 GBP
Retailer 2£811 GBP
Retailer 4£1,250 GBP
Retailer 8£1,376 GBP
Retailer 5£1,546 GBP
Retailer 7£2,133 GBP
Retailer 3£2,494 GBP
Retailer 6£3,212 GBP

2 data points across 8 retailers

1 retailer

B+
Brilliant Earth
19757799A · Oct 31
£687 GBP
$920 USD
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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.

B+
1.50ct Marquise
£687 GBP