CaratHunter
Plans
Oval|Lab Grown|IGI

1.28ct D SI1 Oval Lab Grown Diamond

ID • D/SI1 • IGI LG621476577

Shape and cutting style on the report: Oval brilliant

Certificate IGI LG621476577

Diamond specifications and retailer prices

From £125 GBP
As of November 3, 2026
Save £597 GBP (83%) vs most expensive(unlock to see where)
14 retailers carry this diamond
Most expensive: £722 GBP at MOH London · As of November 4, 2026
View at MOH London

About this 1.28ct lab-grown oval diamond

This 1.28ct lab-grown oval 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 LG621476577 or 621476577. Listed at 14 retailers as of November 3, 2026, with prices from £125 to £722, a £597 spread on the same certified stone. MOH London lists it at £722. 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

1.28
Carat
D
Colour
SI1
Clarity
Ideal
Cut

Specifications

CutIdeal
PolishExcellent
SymmetryExcellent
FluorescenceNone
Crown angle35.7°
Pavilion angle40.6°
OriginLab Grown
Grading LabIGI
CertificateIGI LG621476577
Dimensions9.06 × 6.04 × 3.75 mm
L/W Ratio1.50
Girdle conditionFaceted
Culet sizePointed
Cert comments
This Laboratory Grown Diamond was created by Chemical Vapor Deposition (CVD) growth process and may include post-growth treatment Type IIa
Top View
9.06 mm6.04 mm1.28 ctD / SI1
OriginLab Grown
CutIdeal
PolishExcellent
SymmetryExcellent
FluorescenceNone
CertificateIGI LG621476577
Side View
Table 60.0%Crown 35.7°Girdle: MED-STKPavilion 40.6°Culet: NoneDepth 62.1%

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: Nov 3
Current: £722 GBP|Low: £125 GBP|High: £732 GBP|Avg: £343 GBP|-0.3%
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
Retailer 14
Retailer 15
November 4, 2026
Retailer 3£125 GBP
Retailer 10£145 GBP
Retailer 13£155 GBP
Retailer 14£155 GBP
Retailer 12£186 GBP
Retailer 8£272 GBP
Retailer 9£274 GBP
Retailer 4£279 GBP
Retailer 7£359 GBP
Retailer 6£399 GBP
Retailer 2£452 GBP
Retailer 15£498 GBP
Retailer 11£526 GBP
Retailer 5£560 GBP
MOH London£722 GBP

38 data points across 15 retailers

14 retailers£125 GBP to £722 GBP

A
Cheapest Retailer
-
£125 GBP
A
Retailer 2
-
£145 GBP
View
Retailer 3
-
£155 GBP
View
Price last confirmed 12 days ago
A
Retailer 4
-
£155 GBP
View
A
Retailer 5
-
£272 GBP
View
A
Retailer 6
-
£274 GBP
View
B+
Retailer 7
-
£279 GBP
View
B+
Retailer 8
-
£359 GBP
View
B+
Retailer 9
-
£399 GBP
View
B+
Retailer 10
-
£452 GBP
View
B+
Retailer 11
-
£498 GBP
View
B
Retailer 12
-
£526 GBP
View
B
Retailer 13
-
£560 GBP
View
Most Expensive
B
MOH London
LG621476577 · Nov 4
£722 GBP
View
13 more retailers have this diamond
Prices start from £125 GBPSave up to £597 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
1.28ct Oval
£125 GBP