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1.51ct K SI1 Round Lab Grown Diamond

EX • K/SI1 • IGI LG451055677

Shape and cutting style on the report: Round brilliant

Certificate IGI LG451055677

Diamond specifications and retailer prices

From £698 GBP
As of November 5, 2026
Save £2,042 GBP (75%) vs most expensive(unlock to see where)
10 retailers carry this diamond
Most expensive: £2,740 GBP at MOH London · As of November 5, 2026
View at MOH London

About this 1.51ct lab-grown round diamond

This 1.51ct lab-grown round sits in the one-and-a-half to two carat band, graded K colour (faint-tinted) and SI1 clarity (slightly-included), with a top-tier cut grade and certified by IGI LG451055677 or 451055677. Listed at 10 retailers as of November 5, 2026, with prices from £698 to £2,740, a £2,042 spread on the same certified stone. MOH London lists it at £2,740. 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

1.51
Carat
K
Colour
SI1
Clarity
Excellent
Cut

Specifications

CutExcellent
PolishExcellent
SymmetryExcellent
FluorescenceNone
Crown angle36.1°
Pavilion angle40.9°
OriginLab Grown
Grading LabIGI
CertificateIGI LG451055677
Dimensions7.26 × 7.31 × 4.57 mm
L/W Ratio1.01
Girdle conditionFaceted
Culet sizePointed
Cert comments
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Top View
7.26 mm7.31 mm1.51 ctK / SI1
OriginLab Grown
CutExcellent
PolishExcellent
SymmetryExcellent
FluorescenceNone
CertificateIGI LG451055677
Side View
Table 58.0%Crown 36.1°Girdle: MED-STKPavilion 40.9°Culet: NoneDepth 62.7%

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 5
Current: £2,740 GBP|Low: £670 GBP|High: £2,785 GBP|Avg: £1,320 GBP|-1.3%
MOH London
Retailer 2
Retailer 3
Retailer 4
Retailer 5
Retailer 6
Retailer 7
Retailer 8
Retailer 9
November 6, 2026
Retailer 5£698 GBP
Retailer 6£810 GBP
Retailer 8£810 GBP
Retailer 2£886 GBP
Retailer 3£940 GBP
Retailer 9£1,192 GBP
Retailer 7£1,297 GBP
Retailer 4£1,746 GBP
MOH London£2,740 GBP

28 data points across 9 retailers

10 retailers£698 GBP to £2,740 GBP

A
Cheapest Retailer
-
£698 GBP
A
Retailer 2
-
£760 GBP
View
Retailer 3
-
£810 GBP
View
Price last confirmed 25 days ago
A
Retailer 4
-
£810 GBP
View
A
Retailer 5
-
£886 GBP
View
B+
Retailer 6
-
£940 GBP
View
B
Retailer 7
-
£1,297 GBP
View
B
Retailer 8
-
£1,746 GBP
View
B
Retailer 9
-
£2,278 GBP
View
Most Expensive
B
MOH London
LG451055677 · Nov 5
£2,740 GBP
View
9 more retailers have this diamond
Prices start from £698 GBPSave up to £2,042 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
1.51ct Round
£698 GBP