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Marquise|Lab Grown|IGI

1.55ct I SI1 Marquise Lab Grown Diamond

ID • I/SI1 • IGI LG436046738

Shape and cutting style on the report: Marquise brilliant

Certificate IGI LG436046738

Diamond specifications and retailer prices

From £693 GBP
$930 USD
As of November 2, 2026
Save £3,023 GBP (81%) vs most expensive(unlock to see where)
12 retailers carry this diamond
Most expensive: £3,716 GBP at MOH London · As of November 1, 2026
View at MOH London

About this 1.55ct lab-grown marquise diamond

This 1.55ct 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 LG436046738 or 436046738. Listed at 12 retailers as of November 1, 2026, with prices from £693 to £3,716, a £3,023 spread on the same certified stone. MOH London lists it at £3,716. 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

1.55
Carat
I
Colour
SI1
Clarity
Ideal
Cut

Specifications

CutIdeal
PolishExcellent
SymmetryExcellent
FluorescenceNone
Crown angle36.5°
Pavilion angle41°
OriginLab Grown
Grading LabIGI
CertificateIGI LG436046738
Dimensions11.23 × 6.17 × 3.90 mm
L/W Ratio1.82
Girdle conditionFaceted
Culet sizePointed
Cert comments
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Top View
11.23 mm6.17 mm1.55 ctI / SI1
OriginLab Grown
CutIdeal
PolishExcellent
SymmetryExcellent
FluorescenceNone
CertificateIGI LG436046738
Side View
Table 58.5%Crown 36.5°Girdle: MED-STKPavilion 41°Culet: NoneDepth 63.2%

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 2
Current: £3,716 GBP|Low: £693 GBP|High: £3,761 GBP|Avg: £1,727 GBP
MOH London
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
Retailer 15
November 2, 2026
Retailer 8£693 GBP
Retailer 9£997 GBP
Retailer 13£1,085 GBP
Retailer 15£1,116 GBP
Retailer 10£1,157 GBP
Retailer 14£1,157 GBP
Retailer 3£1,285 GBP
Retailer 7£1,455 GBP
Retailer 5£1,589 GBP
Retailer 2£1,651 GBP
Retailer 11£1,828 GBP
Retailer 4£2,156 GBP
Retailer 12£2,168 GBP
Retailer 6£3,311 GBP
MOH London£3,716 GBP

39 data points across 15 retailers

12 retailers£693 GBP to £3,716 GBP

A
Cheapest Retailer
-
£693 GBP
$930 USD
B+
Retailer 2
-
£997 GBP
$1,338 USD
View
B+
Retailer 3
-
£1,085 GBP
$1,456 USD
View
B+
Retailer 4
-
£1,116 GBP
$1,498 USD
View
Final sale: no returns
Retailer 5
-
£1,157 GBP
$1,552 USD
View
Price last confirmed 20 days ago
B+
Retailer 6
-
£1,157 GBP
$1,552 USD
View
B+
Retailer 7
-
£1,285 GBP
$1,725 USD
View
B
Retailer 8
-
£1,651 GBP
View
B
Retailer 9
-
£1,828 GBP
$2,453 USD
View
B
Retailer 10
-
£2,156 GBP
$2,893 USD
View
B
Retailer 11
-
£2,168 GBP
$2,909 USD
View
Most Expensive
B
MOH London
LG436046738 · Nov 1
£3,716 GBP
View
11 more retailers have this diamond
Prices start from £693 GBPSave up to £3,023 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
1.55ct Marquise
£693 GBP