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Round|Lab Grown|IGI

1.09ct I SI1 Round Lab Grown Diamond

ID • I/SI1 • IGI LG451057063

Shape and cutting style on the report: Round brilliant

Certificate IGI LG451057063

Diamond specifications and retailer prices

From £478 GBP
$640 USD
As of October 31, 2026
Save £2,914 GBP (86%) vs most expensive(unlock to see where)
13 retailers carry this diamond
Most expensive: £3,391 GBP at MOH London · As of October 29, 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 I colour (near-colourless) and SI1 clarity (slightly-included), with a top-tier cut grade and certified by IGI LG451057063 or 451057063. Listed at 13 retailers as of October 29, 2026, with prices from £478 to £3,391, a £2,914 spread on the same certified stone. MOH London lists it at £3,391. 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
I
Colour
SI1
Clarity
Ideal
Cut

Specifications

CutIdeal
PolishExcellent
SymmetryExcellent
FluorescenceNone
Crown angle35.9°
Pavilion angle40.4°
OriginLab Grown
Grading LabIGI
CertificateIGI LG451057063
Dimensions6.53 × 6.56 × 4.09 mm
L/W Ratio1.00
Girdle conditionFaceted
Culet sizePointed
Cert comments
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Top View
6.53 mm6.56 mm1.09 ctI / SI1
OriginLab Grown
CutIdeal
PolishExcellent
SymmetryExcellent
FluorescenceNone
CertificateIGI LG451057063
Side View
Table 56.5%Crown 35.9°Girdle: MED-STKPavilion 40.4°Culet: NoneDepth 62.5%

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: Oct 31
Current: £3,391 GBP|Low: £478 GBP|High: £3,419 GBP|Avg: £1,449 GBP|-0.5%
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 1, 2026
Retailer 7£478 GBP
Retailer 9£905 GBP
Retailer 13£984 GBP
Retailer 3£1,014 GBP
Retailer 10£1,050 GBP
Retailer 12£1,050 GBP
Retailer 4£1,179 GBP
Retailer 2£1,374 GBP
Retailer 5£1,471 GBP
Retailer 11£1,665 GBP
Retailer 8£1,797 GBP
Retailer 14£1,968 GBP
Retailer 6£2,011 GBP
MOH London£3,391 GBP

38 data points across 14 retailers

13 retailers£478 GBP to £3,391 GBP

A
Cheapest Retailer
-
£478 GBP
$640 USD
B+
Retailer 2
-
£905 GBP
$1,213 USD
View
B+
Retailer 3
-
£984 GBP
$1,319 USD
View
B+
Retailer 4
-
£1,014 GBP
$1,358 USD
View
Final sale: no returns
B+
Retailer 5
-
£1,050 GBP
$1,407 USD
View
Retailer 6
-
£1,050 GBP
$1,407 USD
View
Price last confirmed 19 days ago
B+
Retailer 7
-
£1,179 GBP
$1,580 USD
View
B+
Retailer 8
-
£1,374 GBP
View
B
Retailer 9
-
£1,665 GBP
$2,231 USD
View
B
Retailer 10
-
£1,797 GBP
€2,293 EUR
View
B
Retailer 11
-
£1,968 GBP
$2,637 USD
View
B
Retailer 12
-
£2,011 GBP
$2,695 USD
View
Most Expensive
B
MOH London
LG451057063 · Oct 29
£3,391 GBP
View
12 more retailers have this diamond
Prices start from £478 GBPSave up to £2,914 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 Round
£478 GBP