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Oval|Lab Grown|IGI

1.28ct F SI1 Oval Lab Grown Diamond

ID • F/SI1 • IGI LG729580171

Shape and cutting style on the report: Oval brilliant

Certificate IGI LG729580171

Diamond specifications and retailer prices

From £124 GBP
$166 USD
As of November 1, 2026
Save £594 GBP (83%) vs most expensive(unlock to see where)
12 retailers carry this diamond
Most expensive: £718 GBP at MOH London · As of November 1, 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 F colour (colourless) and SI1 clarity (slightly-included), with a top-tier cut grade and certified by IGI LG729580171 or 729580171. Listed at 12 retailers as of November 1, 2026, with prices from £124 to £718, a £594 spread on the same certified stone. MOH London lists it at £718. 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
F
Colour
SI1
Clarity
Ideal
Cut

Specifications

CutIdeal
PolishExcellent
SymmetryExcellent
FluorescenceNone
Crown angle32°
Pavilion angle40.8°
OriginLab Grown
Grading LabIGI
CertificateIGI LG729580171
Dimensions9.06 × 6.11 × 3.68 mm
L/W Ratio1.48
Girdle conditionFaceted
Culet sizePointed
Cert comments
This Laboratory Grown Diamond was created by Chemical Vapor Deposition (CVD) growth process Type IIa
Top View
9.06 mm6.11 mm1.28 ctF / SI1
OriginLab Grown
CutIdeal
PolishExcellent
SymmetryExcellent
FluorescenceNone
CertificateIGI LG729580171
Side View
Table 61.0%Crown 32°Girdle: MED-STKPavilion 40.8°Culet: NoneDepth 60.2%

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 1
Current: £718 GBP|Low: £124 GBP|High: £993 GBP|Avg: £396 GBP|-0.5%
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
Retailer 16
November 1, 2026
Retailer 11£124 GBP
Retailer 4£143 GBP
Retailer 12£154 GBP
Retailer 15£172 GBP
Retailer 2£199 GBP
Retailer 9£272 GBP
Retailer 16£277 GBP
Retailer 5£292 GBP
Retailer 14£335 GBP
Retailer 13£342 GBP
Retailer 3£493 GBP
Retailer 10£521 GBP
Retailer 7£523 GBP
Retailer 6£690 GBP
MOH London£718 GBP
Retailer 8£993 GBP

6 data points across 16 retailers

12 retailers£124 GBP to £718 GBP

A
Cheapest Retailer
-
£124 GBP
$166 USD
A
Retailer 2
-
£143 GBP
$192 USD
View
A
Retailer 3
-
£154 GBP
$206 USD
View
A
Retailer 4
-
£172 GBP
HK$1,800 HKD
View
A
Retailer 5
-
£199 GBP
View
A
Retailer 6
-
£272 GBP
View
B+
Retailer 7
-
£277 GBP
$371 USD
View
B+
Retailer 8
-
£335 GBP
$449 USD
View
B+
Retailer 9
-
£342 GBP
$458 USD
View
B
Retailer 10
-
£493 GBP
$661 USD
View
B
Retailer 11
-
£521 GBP
$698 USD
View
Most Expensive
B
MOH London
LG729580171 · Nov 1
£718 GBP
View
11 more retailers have this diamond
Prices start from £124 GBPSave up to £594 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
£124 GBP