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Round|Lab Grown|IGI

1.20ct I SI1 Round Lab Grown Diamond

EX • I/SI1 • IGI LG436074550

Shape and cutting style on the report: Round brilliant

Certificate IGI LG436074550

Diamond specifications and retailer prices

From £463 GBP
$620 USD
As of October 29, 2026
Save £3,364 GBP (88%) vs most expensive(unlock to see where)
13 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 LG436074550 or 436074550. Listed at 13 retailers as of October 29, 2026, with prices from £463 to £3,826, a £3,364 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
Excellent
Cut

Specifications

CutExcellent
PolishExcellent
SymmetryExcellent
FluorescenceNone
Crown angle33.4°
Pavilion angle41.1°
OriginLab Grown
Grading LabIGI
CertificateIGI LG436074550
Dimensions6.79 × 6.82 × 4.17 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
6.79 mm6.82 mm1.20 ctI / SI1
OriginLab Grown
CutExcellent
PolishExcellent
SymmetryExcellent
FluorescenceNone
CertificateIGI LG436074550
Side View
Table 59.5%Crown 33.4°Girdle: UNDPavilion 41.1°Culet: NoneDepth 61.3%

Caratlytics Score

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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 29
Current: £3,826 GBP|Low: £463 GBP|High: £3,857 GBP|Avg: £1,750 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
October 30, 2026
Retailer 11£463 GBP
Retailer 10£1,021 GBP
Retailer 3£1,111 GBP
Retailer 15£1,143 GBP
Retailer 12£1,184 GBP
Retailer 14£1,184 GBP
Retailer 9£1,314 GBP
Retailer 2£1,555 GBP
Retailer 5£1,612 GBP
Retailer 13£1,872 GBP
Retailer 8£2,023 GBP
Retailer 6£2,208 GBP
Retailer 4£2,220 GBP
Retailer 7£3,391 GBP
MOH London£3,826 GBP

38 data points across 15 retailers

13 retailers£463 GBP to £3,826 GBP

A
Cheapest Retailer
-
£463 GBP
$620 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
-
£1,555 GBP
View
B
Retailer 9
-
£1,872 GBP
$2,508 USD
View
B
Retailer 10
-
£2,023 GBP
€2,582 EUR
View
B
Retailer 11
-
£2,208 GBP
$2,958 USD
View
B
Retailer 12
-
£2,220 GBP
$2,975 USD
View
Most Expensive
B
MOH London
LG436074550 · Oct 29
£3,826 GBP
View
12 more retailers have this diamond
Prices start from £463 GBPSave up to £3,364 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
£463 GBP