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Round|Lab Grown|IGI

1.23ct D SI1 Round Lab Grown Diamond

ID • D/SI1 • IGI LG660459723

Certificate IGI LG660459723

Diamond specifications and retailer prices

From €532 EUR
As of November 6, 2026
Save €217 EUR (29%) vs most expensive(unlock to see where)
3 retailers carry this diamond
Most expensive: €748 EUR at Zales · As of November 4, 2026
View at Zales

About this 1.23ct lab-grown round diamond

This 1.23ct lab-grown round sits in the classic one-carat band, graded D colour (colourless) and SI1 clarity (slightly-included), with a top-tier cut grade and certified by IGI LG660459723 or 660459723. Listed at 3 retailers as of November 4, 2026, with prices from €532 to €748, a €217 spread on the same certified stone. Zales lists it at €748. 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
D
Colour
SI1
Clarity
Ideal
Cut

Specifications

CutIdeal
PolishExcellent
SymmetryExcellent
FluorescenceNone
OriginLab Grown
Grading LabIGI
CertificateIGI LG660459723
Dimensions6.80 × 6.85 mm
L/W Ratio1.01
Top View
6.80 mm6.85 mm1.23 ctD / SI1
OriginLab Grown
CutIdeal
PolishExcellent
SymmetryExcellent
FluorescenceNone
CertificateIGI LG660459723
Side View
Table 56.0%CrownGirdle: MED-STKPavilionCulet: NoneDepth 62.3%

Caratlytics Score

How it works →
B+
Very Good
Strong quality and value balance
Unlock full score analysis
See the detailed 0 to 100 score with Quality, Value, Certification & Market breakdown

Price History

Last verified: Nov 6
Current: €532 EUR|Low: €532 EUR|High: €1,194 EUR|Avg: €933 EUR|-55.4%
Retailer 1
Retailer 2
Zales
November 6, 2026
Retailer 1€532 EUR
Retailer 2€748 EUR
Zales€748 EUR

8 data points across 3 retailers

3 retailers€532 EUR to €748 EUR

B+
Cheapest Retailer
-
€532 EUR
B
Retailer 2
-
€748 EUR
View
Most Expensive
B
Zales
524116910 · Nov 4
€748 EUR
$840 USD
View
2 more retailers have this diamond
Prices start from €532 EURSave up to €217 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 Round
€532 EUR