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Round|Lab Grown|IGI

1.20ct D IF Round Lab Grown Diamond

ID • D/IF • IGI LG845656939

Shape and cutting style on the report: Round brilliant

Certificate IGI LG845656939

Diamond specifications and retailer prices

From £209 GBP
$280 USD
As of November 1, 2026
Save £894 GBP (81%) vs most expensive(unlock to see where)
14 retailers carry this diamond
Most expensive: £1,103 GBP at Brilliant Earth · As of November 2, 2026
View at Brilliant Earth

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 IF clarity (flawless or internally-flawless), with a top-tier cut grade and certified by IGI LG845656939 or 845656939. Listed at 14 retailers as of November 1, 2026, with prices from £209 to £1,103, a £894 spread on the same certified stone. Brilliant Earth lists it at £1,103. Compare the cross-retailer prices above before buying. The same certified stone often varies 15 to 40% across stores.

The 4Cs

1.20
Carat
D
Colour
IF
Clarity
Ideal
Cut

Specifications

CutIdeal
PolishExcellent
SymmetryExcellent
FluorescenceNone
Crown angle35.1°
Pavilion angle40.8°
OriginLab Grown
Grading LabIGI
CertificateIGI LG845656939
Dimensions6.77 × 6.80 × 4.23 mm
L/W Ratio1.00
Girdle conditionFaceted
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
6.77 mm6.80 mm1.20 ctD / IF
OriginLab Grown
CutIdeal
PolishExcellent
SymmetryExcellent
FluorescenceNone
CertificateIGI LG845656939
Side View
Table 57.0%Crown 35.1°Girdle: MED-STKPavilion 40.8°Culet: NoneDepth 62.3%

Caratlytics Score

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A+
Exceptional
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: £1,103 GBP|Low: £209 GBP|High: £1,103 GBP|Avg: £485 GBP
Brilliant Earth
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 3, 2026
Retailer 12£209 GBP
Retailer 5£258 GBP
Retailer 13£313 GBP
Retailer 9£350 GBP
Retailer 7£368 GBP
Retailer 11£384 GBP
Retailer 8£400 GBP
Retailer 2£440 GBP
Retailer 4£564 GBP
Retailer 10£712 GBP
Retailer 3£749 GBP
Retailer 6£929 GBP
Brilliant Earth£1,103 GBP

13 data points across 13 retailers

14 retailers£209 GBP to £1,103 GBP

A+
Cheapest Retailer
-
£209 GBP
$280 USD
Final sale: no returns
A
Retailer 2
-
£258 GBP
HK$2,700 HKD
View
A
Retailer 3
-
£313 GBP
$420 USD
View
A
Retailer 4
-
£350 GBP
$470 USD
View
A
Retailer 5
-
£368 GBP
View
A
Retailer 6
-
£384 GBP
€491 EUR
View
A
Retailer 7
-
£400 GBP
ZAR 8,676 ZAR
View
A
Retailer 8
-
£440 GBP
View
B+
Retailer 9
-
£564 GBP
A$1,165 AUD
View
B+
Retailer 10
-
£712 GBP
$956 USD
View
B+
Retailer 11
-
£749 GBP
SGD 1,359 SGD
View
B+
Retailer 12
-
£929 GBP
View
B
Retailer 13
-
£1,006 GBP
$1,350 USD
View
Most Expensive
B
Brilliant Earth
22229693A · Nov 2
£1,103 GBP
$1,480 USD
View
13 more retailers have this diamond
Prices start from £209 GBPSave up to £894 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
£209 GBP