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Round|Lab Grown|IGI

1.09ct G SI1 Round Lab Grown Diamond

ID • G/SI1 • IGI LG804642958

Shape and cutting style on the report: Round brilliant

Certificate IGI LG804642958

Diamond specifications and retailer prices

From $143 USD
As of November 1, 2026
Save $688 USD (83%) vs most expensive(unlock to see where)
18 retailers carry this diamond
Most expensive: $831 USD at MOH London · As of November 2, 2026
View at MOH London

About this 1.09ct lab-grown round diamond

This 1.09ct lab-grown round sits in the classic one-carat band, graded G colour (near-colourless) and SI1 clarity (slightly-included), with a top-tier cut grade and certified by IGI LG804642958 or 804642958. Listed at 18 retailers as of November 1, 2026, with prices from $143 to $831, a $688 spread on the same certified stone. MOH London lists it at $831. 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
G
Color
SI1
Clarity
Ideal
Cut

Specifications

CutIdeal
PolishExcellent
SymmetryExcellent
FluorescenceNone
Crown angle34.4°
Pavilion angle40.7°
OriginLab Grown
Grading LabIGI
CertificateIGI LG804642958
Dimensions6.67 × 6.60 × 4.03 mm
L/W Ratio1.01
Girdle conditionFaceted
Cert comments
This Laboratory Grown Diamond was created by Chemical Vapor Deposition (CVD) growth process Type IIa
Top View
6.67 mm6.60 mm1.09 ctG / SI1
OriginLab Grown
CutIdeal
PolishExcellent
SymmetryExcellent
FluorescenceNone
CertificateIGI LG804642958
Side View
Table 60.0%Crown 34.4°Girdle: MED-STKPavilion 40.7°Culet: NoneDepth 60.7%

Caratlytics Score

How it works →
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: Nov 1
Current: $831 USD|Low: $143 USD|High: $898 USD|Avg: $399 USD|-7.5%
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
November 3, 2026
Retailer 12$143 USD
Retailer 11$166 USD
Retailer 6$178 USD
Retailer 2$305 USD
Retailer 8$311 USD
Retailer 3$331 USD
Retailer 14$340 USD
Retailer 9$395 USD
Retailer 10$420 USD
Retailer 13$426 USD
Retailer 7$454 USD
Retailer 5$571 USD
Retailer 4$627 USD
MOH London$831 USD

38 data points across 14 retailers

18 retailers$143 USD to $831 USD

A
Cheapest Retailer
-
$143 USD
A
Retailer 2
-
$166 USD
View
A
Retailer 3
-
$178 USD
View
Retailer 4
-
$190 USD
View
Price last confirmed 8 days ago
A
Retailer 5
-
$305 USD
£240 GBP
View
A
Retailer 6
-
$311 USD
€296 EUR
View
A
Retailer 7
-
$331 USD
View
B+
Retailer 8
-
$340 USD
View
B+
Retailer 9
-
$395 USD
£311 GBP
View
B+
Retailer 10
-
$420 USD
View
B+
Retailer 11
-
$426 USD
View
Retailer 12
-
$435 USD
View
Price last confirmed 91 days ago
B+
Retailer 13
-
$454 USD
View
B
Retailer 14
-
$490 USD
View
B
Retailer 15
-
$571 USD
View
B
Retailer 16
-
$627 USD
View
Retailer 17
-
$645 USD
View
Price last confirmed 8 days ago
Most Expensive
B
MOH London
LG804642958 · Nov 2
$831 USD
£654 GBP
View
17 more retailers have this diamond
Prices start from $143 USDSave up to $688 USD

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 Round
$143 USD