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Round|Lab Grown|IGI

1.20ct D IF Round Lab Grown Diamond

ID • D/IF • IGI LG838654059

Shape and cutting style on the report: Round brilliant

Certificate IGI LG838654059

Diamond specifications and retailer prices

From £241 GBP
$324 USD
As of November 1, 2026
Save £1,577 GBP (87%) vs most expensive(unlock to see where)
19 retailers carry this diamond
Most expensive: £1,818 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 LG838654059 or 838654059. Listed at 19 retailers as of November 1, 2026, with prices from £241 to £1,818, a £1,577 spread on the same certified stone. Brilliant Earth lists it at £1,818. 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 angle35.9°
Pavilion angle40.6°
OriginLab Grown
Grading LabIGI
CertificateIGI LG838654059
Dimensions6.81 × 6.87 × 4.20 mm
L/W Ratio1.01
Girdle conditionFaceted
Cert comments
This Laboratory Grown Diamond was created by Chemical Vapor Deposition (CVD) growth process Type IIa
Top View
6.81 mm6.87 mm1.20 ctD / IF
OriginLab Grown
CutIdeal
PolishExcellent
SymmetryExcellent
FluorescenceNone
CertificateIGI LG838654059
Side View
Table 58.0%Crown 35.9°Girdle: THN-MEDPavilion 40.6°Culet: NoneDepth 61.3%

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: Nov 1
Current: £1,818 GBP|Low: £234 GBP|High: £1,818 GBP|Avg: £708 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
Retailer 14
Retailer 15
November 3, 2026
Retailer 13£241 GBP
Retailer 6£271 GBP
Retailer 15£300 GBP
Retailer 14£402 GBP
Retailer 8£475 GBP
Retailer 9£517 GBP
Retailer 2£529 GBP
Retailer 4£541 GBP
Retailer 12£728 GBP
Retailer 11£729 GBP
Retailer 5£975 GBP
Retailer 7£1,036 GBP
Retailer 3£1,185 GBP
Retailer 10£1,200 GBP
Brilliant Earth£1,818 GBP

39 data points across 15 retailers

19 retailers£241 GBP to £1,818 GBP

A
Cheapest Retailer
-
£241 GBP
$324 USD
Retailer 2
-
£244 GBP
$327 USD
View
Price last confirmed 41 days ago
A
Retailer 3
-
£271 GBP
$363 USD
View
Final sale: no returns
Retailer 4
-
£282 GBP
$379 USD
View
Price last confirmed 41 days ago
Retailer 5
-
£298 GBP
$400 USD
View
Price last confirmed 38 days ago
Retailer 6
-
£300 GBP
$402 USD
View
Price last confirmed 8 days ago
A
Retailer 7
-
£402 GBP
$540 USD
View
A
Retailer 8
-
£475 GBP
€607 EUR
View
B+
Retailer 9
-
£517 GBP
ZAR 11,199 ZAR
View
B+
Retailer 10
-
£529 GBP
View
B+
Retailer 11
-
£541 GBP
$726 USD
View
B+
Retailer 12
-
£728 GBP
A$1,502 AUD
View
B+
Retailer 13
-
£729 GBP
$978 USD
View
Retailer 14
-
£971 GBP
$1,303 USD
View
Price last confirmed 38 days ago
B
Retailer 15
-
£975 GBP
SGD 1,768 SGD
View
B
Retailer 16
-
£1,036 GBP
$1,390 USD
View
B
Retailer 17
-
£1,185 GBP
$1,590 USD
View
B+
Retailer 18
-
£1,200 GBP
View
Most Expensive
B
Brilliant Earth
21659255A · Nov 2
£1,818 GBP
$2,440 USD
View
18 more retailers have this diamond
Prices start from £241 GBPSave up to £1,577 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
£241 GBP