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Round|Lab Grown|IGI

1.23ct I SI1 Round Lab Grown Diamond

EX • I/SI1 • IGI LG407945468

Shape and cutting style on the report: Round brilliant

Certificate IGI LG407945468

Diamond specifications and retailer prices

From €535 EUR
As of November 5, 2026
Save €3,592 EUR (87%) vs most expensive(unlock to see where)
13 retailers carry this diamond
Most expensive: €4,127 EUR at MOH London · As of November 5, 2026
View at MOH London

About this 1.23ct lab-grown round diamond

This 1.23ct lab-grown round sits in the classic one-carat band, graded I colour (near-colourless) and SI1 clarity (slightly-included), with a top-tier cut grade and certified by IGI LG407945468 or 407945468. Listed at 13 retailers as of November 5, 2026, with prices from €535 to €4,127, a €3,592 spread on the same certified stone. MOH London lists it at €4,127. 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
I
Colour
SI1
Clarity
Excellent
Cut

Specifications

CutExcellent
PolishExcellent
SymmetryExcellent
FluorescenceNone
Crown angle35.9°
Pavilion angle40.9°
OriginLab Grown
Grading LabIGI
CertificateIGI LG407945468
Dimensions6.83 × 6.86 × 4.30 mm
L/W Ratio1.00
Girdle conditionFaceted
Culet sizePointed
Cert comments
This Laboratory grown diamond was created by chemical vapor deposition process (CVD) Type IIa
Top View
6.83 mm6.86 mm1.23 ctI / SI1
OriginLab Grown
CutExcellent
PolishExcellent
SymmetryExcellent
FluorescenceNone
CertificateIGI LG407945468
Side View
Table 55.0%Crown 35.9°GirdlePavilion 40.9°Culet: NoneDepth 62.8%

Caratlytics Score

How it works →
A
Excellent
Excellent quality and great value
Unlock full score analysis
See the detailed 0 to 100 score with Quality, Value, Certification & Market breakdown

Price History

Last verified: Nov 5
Current: €4,127 EUR|Low: €535 EUR|High: €4,192 EUR|Avg: €1,910 EUR|-0.2%
MOH London
Retailer 2
Retailer 3
Retailer 4
Retailer 5
Retailer 6
Retailer 7
Retailer 8
Retailer 9
Retailer 10
Retailer 11
November 6, 2026
Retailer 6€535 EUR
Retailer 5€1,249 EUR
Retailer 10€1,359 EUR
Retailer 3€1,398 EUR
Retailer 7€1,449 EUR
Retailer 9€1,449 EUR
Retailer 2€1,885 EUR
Retailer 8€2,286 EUR
Retailer 4€2,455 EUR
Retailer 11€2,716 EUR
MOH London€4,127 EUR

46 data points across 11 retailers

13 retailers€535 EUR to €4,127 EUR

A
Cheapest Retailer
-
€535 EUR
B+
Retailer 2
-
€1,249 EUR
View
B+
Retailer 3
-
€1,359 EUR
View
B+
Retailer 4
-
€1,398 EUR
View
Final sale: no returns
B+
Retailer 5
-
€1,449 EUR
View
Retailer 6
-
€1,449 EUR
View
Price last confirmed 25 days ago
B
Retailer 7
-
€1,599 EUR
View
B+
Retailer 8
-
€1,885 EUR
View
B
Retailer 9
-
€2,286 EUR
View
B
Retailer 10
-
€2,455 EUR
View
B
Retailer 11
-
€2,629 EUR
View
B
Retailer 12
-
€2,716 EUR
View
Most Expensive
B
MOH London
LG407945468 · Nov 5
€4,127 EUR
£3,647 GBP
View
12 more retailers have this diamond
Prices start from €535 EURSave up to €3,592 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.

A
1.23ct Round
€535 EUR