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Round|Lab Grown|IGI

1.03ct I SI1 Round Lab Grown Diamond

EX • I/SI1 • IGI LG451056228

Shape and cutting style on the report: Round brilliant

Certificate IGI LG451056228

Diamond specifications and retailer prices

From £448 GBP
$600 USD
As of October 31, 2026
Save £2,744 GBP (86%) vs most expensive(unlock to see where)
12 retailers carry this diamond
Most expensive: £3,191 GBP at MOH London · As of November 1, 2026
View at MOH London

About this 1.03ct lab-grown round diamond

This 1.03ct 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 LG451056228 or 451056228. Listed at 12 retailers as of October 31, 2026, with prices from £448 to £3,191, a £2,744 spread on the same certified stone. MOH London lists it at £3,191. 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

1.03
Carat
I
Colour
SI1
Clarity
Excellent
Cut

Specifications

CutExcellent
PolishExcellent
SymmetryExcellent
FluorescenceNone
Crown angle34.1°
Pavilion angle41.4°
OriginLab Grown
Grading LabIGI
CertificateIGI LG451056228
Dimensions6.44 × 6.41 × 4.08 mm
L/W Ratio1.00
Girdle conditionFaceted
Culet sizePointed
Cert comments
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Top View
6.44 mm6.41 mm1.03 ctI / SI1
OriginLab Grown
CutExcellent
PolishExcellent
SymmetryExcellent
FluorescenceNone
CertificateIGI LG451056228
Side View
Table 55.5%Crown 34.1°Girdle: MED-STKPavilion 41.4°Culet: NoneDepth 63.4%

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: £3,191 GBP|Low: £448 GBP|High: £3,235 GBP|Avg: £1,507 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
November 1, 2026
Retailer 6£448 GBP
Retailer 7£857 GBP
Retailer 11£959 GBP
Retailer 8£993 GBP
Retailer 10£993 GBP
Retailer 5£1,091 GBP
Retailer 12£1,123 GBP
Retailer 13£1,401 GBP
Retailer 9£1,578 GBP
Retailer 2£1,698 GBP
Retailer 3£1,958 GBP
Retailer 4£2,844 GBP
MOH London£3,191 GBP

26 data points across 13 retailers

12 retailers£448 GBP to £3,191 GBP

A
Cheapest Retailer
-
£448 GBP
$600 USD
B+
Retailer 2
-
£857 GBP
$1,148 USD
View
B+
Retailer 3
-
£931 GBP
$1,248 USD
View
B+
Retailer 4
-
£959 GBP
$1,285 USD
View
Final sale: no returns
Retailer 5
-
£993 GBP
$1,331 USD
View
Price last confirmed 20 days ago
B+
Retailer 6
-
£993 GBP
$1,331 USD
View
B
Retailer 7
-
£1,123 GBP
$1,505 USD
View
B
Retailer 8
-
£1,578 GBP
$2,115 USD
View
B
Retailer 9
-
£1,698 GBP
€2,167 EUR
View
B
Retailer 10
-
£1,862 GBP
$2,495 USD
View
B
Retailer 11
-
£1,958 GBP
$2,623 USD
View
Most Expensive
B
MOH London
LG451056228 · Nov 1
£3,191 GBP
View
11 more retailers have this diamond
Prices start from £448 GBPSave up to £2,744 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
1.03ct Round
£448 GBP