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Round|Lab Grown|IGI

1.25ct D SI1 Round Lab Grown Diamond

VG • D/SI1 • IGI LG784643984

Shape and cutting style on the report: Round brilliant

Certificate IGI LG784643984

Diamond specifications and retailer prices

From £127 GBP
As of November 1, 2026
Save £612 GBP (83%) vs most expensive(unlock to see where)
11 retailers carry this diamond
Most expensive: £739 GBP at MOH London · As of November 2, 2026
View at MOH London

About this 1.25ct lab-grown round diamond

This 1.25ct lab-grown round sits in the one-and-a-quarter to one-and-a-half carat band, graded D colour (colourless) and SI1 clarity (slightly-included), with a very-good cut grade and certified by IGI LG784643984 or 784643984. Listed at 11 retailers as of November 1, 2026, with prices from £127 to £739, a £612 spread on the same certified stone. MOH London lists it at £739. Cut grade matters more than carat or clarity for visible brilliance. If you can shift budget toward an Excellent or Ideal cut, do it before chasing higher colour or clarity.

The 4Cs

1.25
Carat
D
Colour
SI1
Clarity
Very Good
Cut

Specifications

CutVery Good
PolishVery Good
SymmetryVery Good
FluorescenceNone
Crown angle38.9°
Pavilion angle40.2°
OriginLab Grown
Grading LabIGI
CertificateIGI LG784643984
Dimensions6.84 × 6.76 × 4.27 mm
L/W Ratio1.01
Girdle conditionFaceted
Cert comments
As Grown - No indication of post-growth treatment This Laboratory Grown Diamond was created by High Pressure High Temperature (HPHT) growth process Type II
Top View
6.84 mm6.76 mm1.25 ctD / SI1
OriginLab Grown
CutVery Good
PolishVery Good
SymmetryVery Good
FluorescenceNone
CertificateIGI LG784643984
Side View
Table 59.0%Crown 38.9°Girdle: MED-STKPavilion 40.2°Culet: NoneDepth 62.7%

Caratlytics Score

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A
Excellent
Excellent quality and great value
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Price History

Last verified: Nov 1
Current: £739 GBP|Low: £77 GBP|High: £747 GBP|Avg: £288 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
November 4, 2026
Retailer 4£77 GBP
Retailer 8£127 GBP
Retailer 9£143 GBP
Retailer 3£158 GBP
Retailer 5£269 GBP
Retailer 6£281 GBP
Retailer 12£282 GBP
Retailer 11£297 GBP
Retailer 10£344 GBP
Retailer 2£360 GBP
Retailer 7£411 GBP
MOH London£739 GBP

34 data points across 12 retailers

11 retailers£127 GBP to £739 GBP

A
Cheapest Retailer
-
£127 GBP
A
Retailer 2
-
£143 GBP
View
Final sale: no returns
Retailer 3
-
£158 GBP
View
Price last confirmed 12 days ago
A
Retailer 4
-
£269 GBP
View
B+
Retailer 5
-
£281 GBP
View
B+
Retailer 6
-
£282 GBP
View
B+
Retailer 7
-
£297 GBP
View
B+
Retailer 8
-
£344 GBP
View
B+
Retailer 9
-
£360 GBP
View
B
Retailer 10
-
£411 GBP
View
Most Expensive
B
MOH London
LG784643984 · Nov 2
£739 GBP
View
10 more retailers have this diamond
Prices start from £127 GBPSave up to £612 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
1.25ct Round
£127 GBP