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Round|Lab Grown|IGI

1.20ct D SI1 Round Lab Grown Diamond

ID • D/SI1 • IGI LG490195514

Shape and cutting style on the report: Round brilliant

Certificate IGI LG490195514

Diamond specifications and retailer prices

From £174 GBP
$232 USD
As of October 30, 2026
Save £662 GBP (79%) vs most expensive(unlock to see where)
8 retailers carry this diamond
Most expensive: £836 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 D colour (colourless) and SI1 clarity (slightly-included), with a top-tier cut grade and certified by IGI LG490195514 or 490195514. Listed at 8 retailers as of October 29, 2026, with prices from £174 to £836, a £662 spread on the same certified stone. MOH London lists it at £836. 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
D
Colour
SI1
Clarity
Ideal
Cut

Specifications

CutIdeal
PolishExcellent
SymmetryExcellent
FluorescenceNone
Crown angle33.8°
Pavilion angle40.9°
OriginLab Grown
Grading LabIGI
CertificateIGI LG490195514
Dimensions6.85 × 6.82 × 4.18 mm
L/W Ratio1.00
Girdle conditionFaceted
Culet sizePointed
Cert comments
As Grown - No indication of post-growth treatment This Laboratory Grown Diamond was created by High Pressure High Temperature (HPHT) growth process Type II
Top View
6.85 mm6.82 mm1.20 ctD / SI1
OriginLab Grown
CutIdeal
PolishExcellent
SymmetryExcellent
FluorescenceNone
CertificateIGI LG490195514
Side View
Table 58.0%Crown 33.8°Girdle: MED-STKPavilion 40.9°Culet: NoneDepth 61.1%

Caratlytics Score

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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: Oct 30
Current: £836 GBP|Low: £127 GBP|High: £836 GBP|Avg: £395 GBP|+7.0%
MOH London
Retailer 2
Retailer 3
Retailer 4
Retailer 5
Retailer 6
Retailer 7
Retailer 8
October 30, 2026
Retailer 8£174 GBP
Retailer 5£178 GBP
Retailer 3£286 GBP
Retailer 6£312 GBP
Retailer 2£323 GBP
Retailer 4£418 GBP
Retailer 7£612 GBP
MOH London£836 GBP

39 data points across 8 retailers

8 retailers£174 GBP to £836 GBP

A
Cheapest Retailer
-
£174 GBP
$232 USD
Final sale: no returns
Retailer 2
-
£178 GBP
$237 USD
View
Price last confirmed 14 days ago
B+
Retailer 3
-
£286 GBP
$381 USD
View
B+
Retailer 4
-
£312 GBP
$415 USD
View
B+
Retailer 5
-
£323 GBP
View
B+
Retailer 6
-
£418 GBP
$557 USD
View
B
Retailer 7
-
£612 GBP
$815 USD
View
Most Expensive
B
MOH London
LG490195514 · Oct 29
£836 GBP
View
7 more retailers have this diamond
Prices start from £174 GBPSave up to £662 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
£174 GBP