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Round|Lab Grown|IGI

1.03ct K SI1 Round Lab Grown Diamond

EX • K/SI1 • IGI LG407948751

Shape and cutting style on the report: Round brilliant

Certificate IGI LG407948751

Diamond specifications and retailer prices

From £598 GBP
As of November 5, 2026
Save £1,997 GBP (77%) vs most expensive(unlock to see where)
10 retailers carry this diamond
Most expensive: £2,595 GBP at MOH London · As of November 5, 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 K colour (faint-tinted) and SI1 clarity (slightly-included), with a top-tier cut grade and certified by IGI LG407948751 or 407948751. Listed at 10 retailers as of November 5, 2026, with prices from £598 to £2,595, a £1,997 spread on the same certified stone. MOH London lists it at £2,595. 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
K
Colour
SI1
Clarity
Excellent
Cut

Specifications

CutExcellent
PolishExcellent
SymmetryExcellent
FluorescenceNone
Crown angle36°
Pavilion angle40.8°
OriginLab Grown
Grading LabIGI
CertificateIGI LG407948751
Dimensions6.38 × 6.42 × 4.02 mm
L/W Ratio1.01
Girdle conditionFaceted
Culet sizePointed
Cert comments
This Laboratory grown diamond was created by chemical vapor deposition process (CVD) Type IIa
Top View
6.38 mm6.42 mm1.03 ctK / SI1
OriginLab Grown
CutExcellent
PolishExcellent
SymmetryExcellent
FluorescenceNone
CertificateIGI LG407948751
Side View
Table 57.0%Crown 36°Girdle: MED-STKPavilion 40.8°Culet: NoneDepth 62.8%

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 5
Current: £2,595 GBP|Low: £574 GBP|High: £2,636 GBP|Avg: £1,196 GBP|-0.3%
MOH London
Retailer 2
Retailer 3
Retailer 4
Retailer 5
Retailer 6
Retailer 7
Retailer 8
November 6, 2026
Retailer 5£598 GBP
Retailer 6£694 GBP
Retailer 8£694 GBP
Retailer 3£825 GBP
Retailer 2£1,026 GBP
Retailer 7£1,119 GBP
Retailer 4£1,651 GBP
MOH London£2,595 GBP

33 data points across 8 retailers

10 retailers£598 GBP to £2,595 GBP

A
Cheapest Retailer
-
£598 GBP
A
Retailer 2
-
£651 GBP
View
B+
Retailer 3
-
£694 GBP
View
Retailer 4
-
£694 GBP
View
Price last confirmed 25 days ago
B+
Retailer 5
-
£825 GBP
View
B+
Retailer 6
-
£1,026 GBP
View
B
Retailer 7
-
£1,119 GBP
View
B
Retailer 8
-
£1,651 GBP
View
B
Retailer 9
-
£1,952 GBP
View
Most Expensive
B
MOH London
LG407948751 · Nov 5
£2,595 GBP
View
9 more retailers have this diamond
Prices start from £598 GBPSave up to £1,997 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
£598 GBP