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Round|Lab Grown|IGI

1.20ct H SI1 Round Lab Grown Diamond

ID • H/SI1 • IGI LG487108268

Shape and cutting style on the report: Round brilliant

Certificate IGI LG487108268

Diamond specifications and retailer prices

From £586 GBP
As of November 5, 2026
Save £1,961 GBP (77%) vs most expensive(unlock to see where)
12 retailers carry this diamond
Most expensive: £2,548 GBP at MOH London · As of November 3, 2026
View at MOH London

About this 1.2ct lab-grown round diamond

This 1.2ct lab-grown round sits in the classic one-carat band, graded H colour (near-colourless) and SI1 clarity (slightly-included), with a top-tier cut grade and certified by IGI LG487108268 or 487108268. Listed at 12 retailers as of November 3, 2026, with prices from £586 to £2,548, a £1,961 spread on the same certified stone. MOH London lists it at £2,548. 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

1.20
Carat
H
Colour
SI1
Clarity
Ideal
Cut

Specifications

CutIdeal
PolishExcellent
SymmetryExcellent
FluorescenceNone
Crown angle34.9°
Pavilion angle41°
OriginLab Grown
Grading LabIGI
CertificateIGI LG487108268
Dimensions6.78 × 6.75 × 4.23 mm
L/W Ratio1.00
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
6.78 mm6.75 mm1.20 ctH / SI1
OriginLab Grown
CutIdeal
PolishExcellent
SymmetryExcellent
FluorescenceNone
CertificateIGI LG487108268
Side View
Table 57.0%Crown 34.9°Girdle: MED-STKPavilion 41°Culet: NoneDepth 62.5%

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 5
Current: £2,548 GBP|Low: £562 GBP|High: £2,578 GBP|Avg: £1,088 GBP
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
November 6, 2026
Retailer 7£586 GBP
Retailer 13£637 GBP
Retailer 12£656 GBP
Retailer 8£661 GBP
Retailer 9£680 GBP
Retailer 11£680 GBP
Retailer 4£810 GBP
Retailer 5£1,055 GBP
Retailer 10£1,097 GBP
Retailer 2£1,126 GBP
Retailer 6£1,616 GBP
Retailer 3£1,911 GBP
MOH London£2,548 GBP

43 data points across 13 retailers

12 retailers£586 GBP to £2,548 GBP

A
Cheapest Retailer
-
£586 GBP
A
Retailer 2
-
£637 GBP
View
A
Retailer 3
-
£656 GBP
View
Final sale: no returns
A
Retailer 4
-
£661 GBP
View
A
Retailer 5
-
£680 GBP
View
Retailer 6
-
£680 GBP
View
Price last confirmed 25 days ago
A
Retailer 7
-
£810 GBP
View
B+
Retailer 8
-
£1,097 GBP
View
B+
Retailer 9
-
£1,126 GBP
View
B
Retailer 10
-
£1,616 GBP
View
B
Retailer 11
-
£1,911 GBP
View
Most Expensive
B
MOH London
LG487108268 · Nov 3
£2,548 GBP
View
11 more retailers have this diamond
Prices start from £586 GBPSave up to £1,961 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
1.20ct Round
£586 GBP