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Heart|Lab Grown|IGI

1.23ct E SI1 Heart Lab Grown Diamond

EX • E/SI1 • IGI LG592320623

Shape and cutting style on the report: Heart brilliant

Certificate IGI LG592320623

Diamond specifications and retailer prices

From €556 EUR
$621 USD
As of October 31, 2026
Save €232 EUR (29%) vs most expensive(unlock to see where)
2 retailers carry this diamond
Most expensive: €788 EUR at Brilliant Earth · As of October 31, 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 E colour (colourless) and SI1 clarity (slightly-included), with a top-tier cut grade and certified by IGI LG592320623 or 592320623. Listed at 2 retailers as of October 31, 2026, with prices from €556 to €788, a €232 spread on the same certified stone. Brilliant Earth lists it at €788. SI-grade stones are eye-clean roughly 60 to 70% of the time at this carat range. Check the inclusion plot on the cert and ask the retailer for high-resolution video before buying.

The 4Cs

1.23
Carat
E
Color
SI1
Clarity
Excellent
Cut

Specifications

CutExcellent
PolishExcellent
SymmetryExcellent
FluorescenceNone
Crown angle34.4°
Pavilion angle35.2°
OriginLab Grown
Grading LabIGI
CertificateIGI LG592320623
Dimensions6.56 × 7.47 × 4.18 mm
L/W Ratio1.14
Girdle conditionFaceted
Culet sizePointed
Cert comments
This Laboratory Grown Diamond was created by Chemical Vapor Deposition (CVD) growth process and may include post-growth treatment Type IIa
Top View
6.56 mm7.47 mm1.23 ctE / SI1
OriginLab Grown
CutExcellent
PolishExcellent
SymmetryExcellent
FluorescenceNone
CertificateIGI LG592320623
Side View
Table 57.0%Crown 34.4°Girdle: MediumPavilion 35.2°Culet: NoneDepth 56.0%

Caratlytics Score

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B
Good
Decent quality, room for better deals
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Price History

Last verified: Oct 31
Current: €788 EUR|Low: €380 EUR|High: €1,011 EUR|Avg: €576 EUR|-22.1%
Brilliant Earth
Retailer 2
Retailer 3
Retailer 4
Retailer 5
Retailer 6
Retailer 7
Retailer 8
October 30, 2026
Retailer 6€380 EUR
Retailer 4€385 EUR
Retailer 3€420 EUR
Retailer 5€510 EUR
Retailer 2€556 EUR
Retailer 8€635 EUR
Brilliant Earth€788 EUR
Retailer 7€810 EUR

4 data points across 8 retailers

2 retailers€556 EUR to €788 EUR

B
Cheapest Retailer
-
€556 EUR
$621 USD
Most Expensive
B
Brilliant Earth
17101859A · Oct 31
€788 EUR
$880 USD
View
1 more retailer has this diamond
Prices start from €556 EURSave up to €232 EUR

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.

B
1.23ct Heart
€556 EUR