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Round|Lab Grown|IGI

1.23ct E FL Round Lab Grown Diamond

ID • E/FL • IGI LG816613126

Shape and cutting style on the report: Round brilliant

Certificate IGI LG816613126

Diamond specifications and retailer prices

From £206 GBP
$276 USD
As of October 29, 2026
Save £1,108 GBP (84%) vs most expensive(unlock to see where)
20 retailers carry this diamond
Most expensive: £1,314 GBP at Brilliant Earth · As of October 29, 2026
View at Brilliant Earth

About this 1.23ct lab-grown round diamond

This 1.23ct lab-grown round sits in the classic one-carat band, graded E colour (colourless) and FL clarity (flawless or internally-flawless), with a top-tier cut grade and certified by IGI LG816613126 or 816613126. Listed at 20 retailers as of October 29, 2026, with prices from £206 to £1,314, a £1,108 spread on the same certified stone. Brilliant Earth lists it at £1,314. Compare the cross-retailer prices above before buying. The same certified stone often varies 15 to 40% across stores.

The 4Cs

1.23
Carat
E
Colour
FL
Clarity
Ideal
Cut

Specifications

CutIdeal
PolishExcellent
SymmetryExcellent
FluorescenceNone
Crown angle33.3°
Pavilion angle40.5°
OriginLab Grown
Grading LabIGI
CertificateIGI LG816613126
Dimensions6.97 × 6.93 × 4.19 mm
L/W Ratio1.01
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
6.97 mm6.93 mm1.23 ctE / FL
OriginLab Grown
CutIdeal
PolishExcellent
SymmetryExcellent
FluorescenceNone
CertificateIGI LG816613126
Side View
Table 57.0%Crown 33.3°Girdle: MediumPavilion 40.5°Culet: NoneDepth 60.2%

Caratlytics Score

How it works →
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 29
Current: £1,314 GBP|Low: £198 GBP|High: £1,314 GBP|Avg: £540 GBP
Brilliant Earth
Retailer 2
Retailer 3
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Retailer 20
October 30, 2026
Retailer 3£206 GBP
Retailer 10£230 GBP
Retailer 20£239 GBP
Retailer 12£255 GBP
Retailer 19£255 GBP
Retailer 6£360 GBP
Retailer 17£362 GBP
Retailer 14£420 GBP
Retailer 16£438 GBP
Retailer 13£448 GBP
Retailer 7£498 GBP
Retailer 5£510 GBP
Retailer 8£567 GBP
Retailer 2£645 GBP
Retailer 18£820 GBP
Retailer 9£858 GBP
Retailer 15£1,028 GBP
Retailer 11£1,071 GBP
Retailer 4£1,146 GBP
Brilliant Earth£1,314 GBP

36 data points across 20 retailers

20 retailers£206 GBP to £1,314 GBP

A
Cheapest Retailer
-
£206 GBP
$276 USD
A
Retailer 2
-
£230 GBP
$308 USD
View
Final sale: no returns
A
Retailer 3
-
£239 GBP
$320 USD
View
A
Retailer 4
-
£255 GBP
$342 USD
View
Retailer 5
-
£255 GBP
$342 USD
View
Price last confirmed 18 days ago
A
Retailer 6
-
£360 GBP
$482 USD
View
A
Retailer 7
-
£362 GBP
$485 USD
View
A
Retailer 8
-
£420 GBP
€536 EUR
View
A
Retailer 9
-
£438 GBP
ZAR 9,490 ZAR
View
A
Retailer 10
-
£448 GBP
View
B+
Retailer 11
-
£498 GBP
$667 USD
View
B+
Retailer 12
-
£510 GBP
$683 USD
View
B+
Retailer 13
-
£567 GBP
$760 USD
View
B+
Retailer 14
-
£645 GBP
$864 USD
View
B+
Retailer 15
-
£820 GBP
$1,099 USD
View
B
Retailer 16
-
£858 GBP
$1,150 USD
View
B+
Retailer 17
-
£1,028 GBP
View
B
Retailer 18
-
£1,071 GBP
$1,435 USD
View
Retailer 19
-
£1,146 GBP
$1,535 USD
View
Price last confirmed 12 days ago
Most Expensive
B
Brilliant Earth
21018332A · Oct 29
£1,314 GBP
$1,760 USD
View
19 more retailers have this diamond
Prices start from £206 GBPSave up to £1,108 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
1.23ct Round
£206 GBP