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Marquise|Lab Grown|IGI

1.09ct D SI1 Marquise Lab Grown Diamond

EX • D/SI1 • IGI LG817695830

Shape and cutting style on the report: Marquise brilliant

Certificate IGI LG817695830

Diamond specifications and retailer prices

From £125 GBP
As of November 6, 2026
Save £692 GBP (85%) vs most expensive(unlock to see where)
19 retailers carry this diamond
Most expensive: £817 GBP at Brilliant Earth · As of November 4, 2026
View at Brilliant Earth

About this 1.09ct lab-grown marquise diamond

This 1.09ct lab-grown marquise sits in the classic one-carat band, graded D colour (colourless) and SI1 clarity (slightly-included), with a top-tier cut grade and certified by IGI LG817695830 or 817695830. Listed at 19 retailers as of November 4, 2026, with prices from £125 to £817, a £692 spread on the same certified stone. Brilliant Earth lists it at £817. 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

1.09
Carat
D
Colour
SI1
Clarity
Excellent
Cut

Specifications

CutExcellent
PolishExcellent
SymmetryExcellent
FluorescenceNone
Crown angle37°
Pavilion angle40.1°
OriginLab Grown
Grading LabIGI
CertificateIGI LG817695830
Dimensions10.94 × 5.27 × 3.28 mm
L/W Ratio2.08
Girdle conditionFaceted
Cert comments
This Laboratory Grown Diamond was created by Chemical Vapor Deposition (CVD) growth process Type IIa
Top View
10.94 mm5.27 mm1.09 ctD / SI1
OriginLab Grown
CutExcellent
PolishExcellent
SymmetryExcellent
FluorescenceNone
CertificateIGI LG817695830
Side View
Table 62.0%Crown 37°Girdle: MED-STKPavilion 40.1°Culet: NoneDepth 62.2%

Caratlytics Score

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A
Excellent
Excellent quality and great value
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Price History

Last verified: Nov 6
Current: £817 GBP|Low: £121 GBP|High: £817 GBP|Avg: £341 GBP|+0.9%
Brilliant Earth
Retailer 2
Retailer 3
Retailer 4
Retailer 5
Retailer 6
Retailer 7
Retailer 8
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Retailer 10
Retailer 11
Retailer 12
Retailer 13
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Retailer 18
November 6, 2026
Retailer 4£125 GBP
Retailer 15£145 GBP
Retailer 16£155 GBP
Retailer 2£157 GBP
Retailer 11£184 GBP
Retailer 8£257 GBP
Retailer 12£272 GBP
Retailer 3£274 GBP
Retailer 5£277 GBP
Retailer 9£285 GBP
Retailer 18£356 GBP
Retailer 14£397 GBP
Retailer 10£427 GBP
Retailer 17£497 GBP
Retailer 7£538 GBP
Retailer 13£721 GBP
Retailer 6£811 GBP
Brilliant Earth£817 GBP

32 data points across 18 retailers

19 retailers£125 GBP to £817 GBP

A
Cheapest Retailer
-
£125 GBP
A
Retailer 2
-
£145 GBP
View
Retailer 3
-
£150 GBP
View
Price last confirmed 12 days ago
A
Retailer 4
-
£155 GBP
View
A
Retailer 5
-
£157 GBP
View
Final sale: no returns
A
Retailer 6
-
£184 GBP
View
Retailer 7
-
£257 GBP
View
Price last confirmed 8 days ago
B+
Retailer 8
-
£272 GBP
View
B+
Retailer 9
-
£274 GBP
View
B+
Retailer 10
-
£277 GBP
View
Retailer 11
-
£285 GBP
View
Price last confirmed 9 days ago
B+
Retailer 12
-
£356 GBP
View
B+
Retailer 13
-
£397 GBP
View
Retailer 14
-
£427 GBP
View
Price last confirmed 9 days ago
B
Retailer 15
-
£497 GBP
View
B
Retailer 16
-
£538 GBP
View
B
Retailer 17
-
£721 GBP
View
B
Retailer 18
-
£811 GBP
View
Most Expensive
B
Brilliant Earth
20750167A · Nov 4
£817 GBP
$1,100 USD
View
18 more retailers have this diamond
Prices start from £125 GBPSave up to £692 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
1.09ct Marquise
£125 GBP