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Round|Lab Grown|IGI

1.05ct I SI1 Round Lab Grown Diamond

ID • I/SI1 • IGI LG492123220

Shape and cutting style on the report: Round brilliant

Certificate IGI LG492123220

Diamond specifications and retailer prices

From £455 GBP
$610 USD
As of October 31, 2026
Save £2,797 GBP (86%) vs most expensive(unlock to see where)
13 retailers carry this diamond
Most expensive: £3,252 GBP at MOH London · As of November 1, 2026
View at MOH London

About this 1.05ct lab-grown round diamond

This 1.05ct 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 LG492123220 or 492123220. Listed at 13 retailers as of October 31, 2026, with prices from £455 to £3,252, a £2,797 spread on the same certified stone. MOH London lists it at £3,252. 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

1.05
Carat
I
Colour
SI1
Clarity
Ideal
Cut

Specifications

CutIdeal
PolishExcellent
SymmetryExcellent
FluorescenceNone
Crown angle32.9°
Pavilion angle40.9°
OriginLab Grown
Grading LabIGI
CertificateIGI LG492123220
Dimensions6.54 × 6.56 × 4.01 mm
L/W Ratio1.00
Girdle conditionFaceted
Culet sizePointed
Cert comments
This Laboratory Grown Diamond was created by Chemical Vapor Deposition (CVD) growth process and may include post-growth treatment Type IIa
Top View
6.54 mm6.56 mm1.05 ctI / SI1
OriginLab Grown
CutIdeal
PolishExcellent
SymmetryExcellent
FluorescenceNone
CertificateIGI LG492123220
Side View
Table 57.0%Crown 32.9°Girdle: MediumPavilion 40.9°Culet: NoneDepth 61.2%

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: Oct 31
Current: £3,252 GBP|Low: £455 GBP|High: £3,296 GBP|Avg: £1,407 GBP|-1.1%
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£455 GBP
Retailer 9£872 GBP
Retailer 3£949 GBP
Retailer 13£978 GBP
Retailer 10£1,012 GBP
Retailer 12£1,012 GBP
Retailer 4£1,142 GBP
Retailer 2£1,325 GBP
Retailer 5£1,424 GBP
Retailer 11£1,607 GBP
Retailer 8£1,733 GBP
Retailer 14£1,897 GBP
Retailer 6£1,995 GBP
MOH London£3,252 GBP

36 data points across 14 retailers

13 retailers£455 GBP to £3,252 GBP

A
Cheapest Retailer
-
£455 GBP
$610 USD
B+
Retailer 2
-
£872 GBP
$1,169 USD
View
B+
Retailer 3
-
£949 GBP
$1,272 USD
View
B+
Retailer 4
-
£978 GBP
$1,310 USD
View
Final sale: no returns
B+
Retailer 5
-
£1,012 GBP
$1,356 USD
View
Retailer 6
-
£1,012 GBP
$1,356 USD
View
Price last confirmed 19 days ago
B+
Retailer 7
-
£1,142 GBP
$1,530 USD
View
B+
Retailer 8
-
£1,325 GBP
View
B
Retailer 9
-
£1,607 GBP
$2,153 USD
View
B
Retailer 10
-
£1,733 GBP
€2,212 EUR
View
B
Retailer 11
-
£1,897 GBP
$2,542 USD
View
B
Retailer 12
-
£1,995 GBP
$2,673 USD
View
Most Expensive
B
MOH London
LG492123220 · Nov 1
£3,252 GBP
View
12 more retailers have this diamond
Prices start from £455 GBPSave up to £2,797 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
1.05ct Round
£455 GBP