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Round|Lab Grown|IGI

1.25ct D SI1 Round Lab Grown Diamond

ID • D/SI1 • IGI LG781613089

Shape and cutting style on the report: Round brilliant

Certificate IGI LG781613089

Diamond specifications and retailer prices

From £285 GBP
As of November 5, 2026
Save £468 GBP (62%) vs most expensive(unlock to see where)
6 retailers carry this diamond
Most expensive: £753 GBP at MOH London · As of November 5, 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 top-tier cut grade and certified by IGI LG781613089 or 781613089. Listed at 6 retailers as of November 5, 2026, with prices from £285 to £753, a £468 spread on the same certified stone. MOH London lists it at £753. 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

1.25
Carat
D
Colour
SI1
Clarity
Ideal
Cut

Specifications

CutIdeal
PolishExcellent
SymmetryExcellent
FluorescenceNone
Crown angle34°
Pavilion angle40.6°
OriginLab Grown
Grading LabIGI
CertificateIGI LG781613089
Dimensions6.96 × 6.94 × 4.19 mm
L/W Ratio1.00
Girdle conditionFaceted
Cert comments
This Laboratory Grown Diamond was created by Chemical Vapor Deposition (CVD) growth process Type IIa
Top View
6.96 mm6.94 mm1.25 ctD / SI1
OriginLab Grown
CutIdeal
PolishExcellent
SymmetryExcellent
FluorescenceNone
CertificateIGI LG781613089
Side View
Table 59.0%Crown 34°Girdle: MediumPavilion 40.6°Culet: NoneDepth 60.3%

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: £753 GBP|Low: £257 GBP|High: £772 GBP|Avg: £395 GBP|+4.3%
MOH London
Retailer 2
Retailer 3
Retailer 4
Retailer 5
Retailer 6
November 5, 2026
Retailer 2£285 GBP
Retailer 6£287 GBP
Retailer 3£297 GBP
Retailer 4£364 GBP
Retailer 5£403 GBP
MOH London£753 GBP

42 data points across 6 retailers

6 retailers£285 GBP to £753 GBP

A
Cheapest Retailer
-
£285 GBP
A
Retailer 2
-
£287 GBP
View
A
Retailer 3
-
£297 GBP
View
B+
Retailer 4
-
£364 GBP
View
B+
Retailer 5
-
£403 GBP
View
Most Expensive
B
MOH London
LG781613089 · Nov 5
£753 GBP
View
5 more retailers have this diamond
Prices start from £285 GBPSave up to £468 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
£285 GBP