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Round|Lab Grown|IGI

1.20ct I SI1 Round Lab Grown Diamond

ID • I/SI1 • IGI LG436072235

Shape and cutting style on the report: Round brilliant

Certificate IGI LG436072235

Diamond specifications and retailer prices

From £396 GBP
$530 USD
As of October 30, 2026
Save £3,431 GBP (90%) vs most expensive(unlock to see where)
12 retailers carry this diamond
Most expensive: £3,826 GBP at MOH London · As of October 29, 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 I colour (near-colourless) and SI1 clarity (slightly-included), with a top-tier cut grade and certified by IGI LG436072235 or 436072235. Listed at 12 retailers as of October 29, 2026, with prices from £396 to £3,826, a £3,431 spread on the same certified stone. MOH London lists it at £3,826. 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
I
Colour
SI1
Clarity
Ideal
Cut

Specifications

CutIdeal
PolishExcellent
SymmetryExcellent
FluorescenceNone
Crown angle33.7°
Pavilion angle41.4°
OriginLab Grown
Grading LabIGI
CertificateIGI LG436072235
Dimensions6.83 × 6.85 × 4.26 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
6.83 mm6.85 mm1.20 ctI / SI1
OriginLab Grown
CutIdeal
PolishExcellent
SymmetryExcellent
FluorescenceNone
CertificateIGI LG436072235
Side View
Table 55.0%Crown 33.7°Girdle: THN-MEDPavilion 41.4°Culet: NoneDepth 62.3%

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: Oct 30
Current: £3,826 GBP|Low: £396 GBP|High: £3,857 GBP|Avg: £1,649 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
October 29, 2026
Retailer 5£396 GBP
Retailer 4£1,021 GBP
Retailer 9£1,143 GBP
Retailer 6£1,184 GBP
Retailer 8£1,184 GBP
Retailer 10£1,314 GBP
Retailer 11£1,612 GBP
Retailer 7£1,872 GBP
Retailer 2£2,023 GBP
Retailer 3£2,208 GBP
MOH London£3,826 GBP

18 data points across 11 retailers

12 retailers£396 GBP to £3,826 GBP

A
Cheapest Retailer
-
£396 GBP
$530 USD
B+
Retailer 2
-
£1,021 GBP
$1,368 USD
View
B+
Retailer 3
-
£1,111 GBP
$1,489 USD
View
B+
Retailer 4
-
£1,143 GBP
$1,532 USD
View
Final sale: no returns
Retailer 5
-
£1,184 GBP
$1,587 USD
View
Price last confirmed 18 days ago
B+
Retailer 6
-
£1,184 GBP
$1,587 USD
View
B
Retailer 7
-
£1,314 GBP
$1,760 USD
View
B
Retailer 8
-
£1,872 GBP
$2,508 USD
View
B
Retailer 9
-
£2,023 GBP
€2,582 EUR
View
B
Retailer 10
-
£2,208 GBP
$2,958 USD
View
B
Retailer 11
-
£2,220 GBP
$2,975 USD
View
Most Expensive
B
MOH London
LG436072235 · Oct 29
£3,826 GBP
View
11 more retailers have this diamond
Prices start from £396 GBPSave up to £3,431 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
£396 GBP