CaratHunter
Plans
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 $884 AUD
$621 USD
As of October 31, 2026
Save $369 AUD (29%) vs most expensive(unlock to see where)
2 retailers carry this diamond
Most expensive: $1,253 AUD at Brilliant Earth · As of October 30, 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 30, 2026, with prices from $884 to $1,253, a $369 spread on the same certified stone. Brilliant Earth lists it at $1,253. 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
Colour
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

How it works →
B
Good
Decent quality, room for better deals
Unlock full score analysis
See the detailed 0 to 100 score with Quality, Value, Certification & Market breakdown

Price History

Last verified: Oct 31
Current: $1,253 AUD|Low: $604 AUD|High: $1,609 AUD|Avg: $916 AUD|-22.1%
Brilliant Earth
Retailer 2
Retailer 3
Retailer 4
Retailer 5
Retailer 6
Retailer 7
Retailer 8
October 30, 2026
Retailer 6$604 AUD
Retailer 4$612 AUD
Retailer 3$668 AUD
Retailer 5$811 AUD
Retailer 2$884 AUD
Retailer 8$1,011 AUD
Brilliant Earth$1,253 AUD
Retailer 7$1,288 AUD

4 data points across 8 retailers

2 retailers$884 AUD to $1,253 AUD

B
Cheapest Retailer
-
$884 AUD
$621 USD
Most Expensive
B
Brilliant Earth
17101859A · Oct 30
$1,253 AUD
$880 USD
View
1 more retailer has this diamond
Prices start from $884 AUDSave up to $369 AUD

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
$884 AUD