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Round|Lab Grown|IGI

1.20ct E IF Round Lab Grown Diamond

ID • E/IF • IGI LG685510748

Shape and cutting style on the report: Round brilliant

Certificate IGI LG685510748

Diamond specifications and retailer prices

From £154 GBP
$206 USD
As of October 29, 2026
Save £1,585 GBP (91%) vs most expensive(unlock to see where)
22 retailers carry this diamond
Most expensive: £1,739 GBP at Brilliant Earth · As of October 29, 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 E colour (colourless) and IF clarity (flawless or internally-flawless), with a top-tier cut grade and certified by IGI LG685510748 or 685510748. Listed at 22 retailers as of October 29, 2026, with prices from £154 to £1,739, a £1,585 spread on the same certified stone. Brilliant Earth lists it at £1,739. Compare the cross-retailer prices above before buying. The same certified stone often varies 15 to 40% across stores.

The 4Cs

1.20
Carat
E
Colour
IF
Clarity
Ideal
Cut

Specifications

CutIdeal
PolishExcellent
SymmetryExcellent
FluorescenceNone
Crown angle35.6°
Pavilion angle40.6°
OriginLab Grown
Grading LabIGI
CertificateIGI LG685510748
Dimensions6.76 × 6.80 × 4.20 mm
L/W Ratio1.01
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
6.76 mm6.80 mm1.20 ctE / IF
OriginLab Grown
CutIdeal
PolishExcellent
SymmetryExcellent
FluorescenceNone
CertificateIGI LG685510748
Side View
Table 57.0%Crown 35.6°Girdle: MED-STKPavilion 40.6°Culet: NoneDepth 61.9%

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 29
Current: £1,739 GBP|Low: £147 GBP|High: £1,739 GBP|Avg: £488 GBP
Brilliant Earth
Retailer 2
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Retailer 21
October 30, 2026
Retailer 20£154 GBP
Retailer 8£172 GBP
Retailer 14£178 GBP
Retailer 4£190 GBP
Retailer 5£190 GBP
Retailer 21£210 GBP
Retailer 9£257 GBP
Retailer 17£322 GBP
Retailer 15£348 GBP
Retailer 2£349 GBP
Retailer 7£372 GBP
Retailer 16£465 GBP
Retailer 6£472 GBP
Retailer 11£611 GBP
Retailer 19£613 GBP
Retailer 12£648 GBP
Retailer 3£651 GBP
Retailer 13£894 GBP
Retailer 18£899 GBP
Retailer 10£904 GBP
Brilliant Earth£1,739 GBP

42 data points across 21 retailers

22 retailers£154 GBP to £1,739 GBP

A
Cheapest Retailer
-
£154 GBP
$206 USD
A
Retailer 2
-
£172 GBP
$230 USD
View
Final sale: no returns
A
Retailer 3
-
£178 GBP
$238 USD
View
A
Retailer 4
-
£190 GBP
$255 USD
View
A
Retailer 5
-
£190 GBP
$255 USD
View
A
Retailer 6
-
£210 GBP
HK$2,200 HKD
View
B+
Retailer 7
-
£257 GBP
$345 USD
View
Retailer 8
-
£322 GBP
ZAR 6,963 ZAR
View
Price last confirmed 7 days ago
A
Retailer 9
-
£348 GBP
€444 EUR
View
A
Retailer 10
-
£349 GBP
View
A
Retailer 11
-
£372 GBP
$498 USD
View
A
Retailer 12
-
£465 GBP
A$959 AUD
View
B+
Retailer 13
-
£472 GBP
$632 USD
View
B+
Retailer 14
-
£611 GBP
$819 USD
View
B+
Retailer 15
-
£613 GBP
$822 USD
View
B+
Retailer 16
-
£648 GBP
$868 USD
View
B+
Retailer 17
-
£651 GBP
$873 USD
View
B+
Retailer 18
-
£894 GBP
View
Retailer 19
-
£899 GBP
$1,205 USD
View
Price last confirmed 12 days ago
B
Retailer 20
-
£904 GBP
$1,211 USD
View
B
Retailer 21
-
£1,706 GBP
View
Most Expensive
B
Brilliant Earth
15027555A · Oct 29
£1,739 GBP
$2,330 USD
View
21 more retailers have this diamond
Prices start from £154 GBPSave up to £1,585 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
£154 GBP