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Heart|Lab Grown|IGI

1.23ct D FL Heart Lab Grown Diamond

ID • D/FL • IGI LG836612562

Shape and cutting style on the report: Heart brilliant

Certificate IGI LG836612562

Diamond specifications and retailer prices

From £256 GBP
$344 USD
As of November 2, 2026
Save £1,666 GBP (87%) vs most expensive(unlock to see where)
19 retailers carry this diamond
Most expensive: £1,923 GBP at Brilliant Earth · As of November 2, 2026
View at Brilliant Earth

About this 1.23ct lab-grown heart diamond

This 1.23ct lab-grown heart sits in the classic one-carat band, graded D colour (colourless) and FL clarity (flawless or internally-flawless), with a top-tier cut grade and certified by IGI LG836612562 or 836612562. Listed at 19 retailers as of November 2, 2026, with prices from £256 to £1,923, a £1,666 spread on the same certified stone. Brilliant Earth lists it at £1,923. Compare the cross-retailer prices above before buying. The same certified stone often varies 15 to 40% across stores.

The 4Cs

1.23
Carat
D
Colour
FL
Clarity
Ideal
Cut

Specifications

CutIdeal
PolishExcellent
SymmetryExcellent
FluorescenceNone
Crown angle36.5°
Pavilion angle37.5°
OriginLab Grown
Grading LabIGI
CertificateIGI LG836612562
Dimensions6.51 × 7.40 × 4.30 mm
L/W Ratio1.14
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
6.51 mm7.40 mm1.23 ctD / FL
OriginLab Grown
CutIdeal
PolishExcellent
SymmetryExcellent
FluorescenceNone
CertificateIGI LG836612562
Side View
Table 57.0%Crown 36.5°Girdle: STK-THKPavilion 37.5°Culet: NoneDepth 58.1%

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: Nov 2
Current: £1,923 GBP|Low: £256 GBP|High: £1,923 GBP|Avg: £680 GBP
Brilliant Earth
Retailer 2
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Retailer 19
November 2, 2026
Retailer 8£256 GBP
Retailer 3£297 GBP
Retailer 9£304 GBP
Retailer 17£318 GBP
Retailer 19£318 GBP
Retailer 12£327 GBP
Retailer 16£432 GBP
Retailer 6£500 GBP
Retailer 10£511 GBP
Retailer 13£548 GBP
Retailer 14£571 GBP
Retailer 4£613 GBP
Retailer 2£799 GBP
Retailer 18£1,022 GBP
Retailer 7£1,053 GBP
Retailer 11£1,148 GBP
Retailer 15£1,248 GBP
Retailer 5£1,319 GBP
Brilliant Earth£1,923 GBP

29 data points across 19 retailers

19 retailers£256 GBP to £1,923 GBP

A
Cheapest Retailer
-
£256 GBP
$344 USD
A
Retailer 2
-
£297 GBP
$399 USD
View
A
Retailer 3
-
£304 GBP
$408 USD
View
Final sale: no returns
Retailer 4
-
£318 GBP
$427 USD
View
Price last confirmed 8 days ago
A
Retailer 5
-
£318 GBP
$427 USD
View
A
Retailer 6
-
£327 GBP
View
A
Retailer 7
-
£432 GBP
$580 USD
View
A
Retailer 8
-
£500 GBP
$671 USD
View
A
Retailer 9
-
£511 GBP
$686 USD
View
B+
Retailer 10
-
£548 GBP
ZAR 11,884 ZAR
View
B+
Retailer 11
-
£571 GBP
View
B+
Retailer 12
-
£613 GBP
$823 USD
View
B+
Retailer 13
-
£799 GBP
$1,072 USD
View
B+
Retailer 14
-
£1,022 GBP
$1,371 USD
View
B+
Retailer 15
-
£1,053 GBP
$1,414 USD
View
B
Retailer 16
-
£1,148 GBP
SGD 2,082 SGD
View
B
Retailer 17
-
£1,248 GBP
View
B
Retailer 18
-
£1,319 GBP
$1,770 USD
View
Most Expensive
B
Brilliant Earth
21621190A · Nov 2
£1,923 GBP
$2,580 USD
View
18 more retailers have this diamond
Prices start from £256 GBPSave up to £1,666 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 Heart
£256 GBP