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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 $600 USD
As of November 5, 2026
Save $4,032 USD (87%) vs most expensive(unlock to see where)
13 retailers carry this diamond
Most expensive: $4,632 USD 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 $600 to $4,632, a $4,032 spread on the same certified stone. MOH London lists it at $4,632. 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
Color
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: $4,632 USD|Low: $600 USD|High: $4,705 USD|Avg: $2,143 USD|-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$600 USD
Retailer 5$1,402 USD
Retailer 10$1,525 USD
Retailer 3$1,569 USD
Retailer 7$1,626 USD
Retailer 9$1,626 USD
Retailer 2$2,116 USD
Retailer 8$2,566 USD
Retailer 4$2,755 USD
Retailer 11$3,048 USD
MOH London$4,632 USD

46 data points across 11 retailers

13 retailers$600 USD to $4,632 USD

A
Cheapest Retailer
-
$600 USD
B+
Retailer 2
-
$1,402 USD
View
B+
Retailer 3
-
$1,525 USD
View
B+
Retailer 4
-
$1,569 USD
View
Final sale: no returns
B+
Retailer 5
-
$1,626 USD
View
Retailer 6
-
$1,626 USD
View
Price last confirmed 25 days ago
B
Retailer 7
-
$1,795 USD
View
B+
Retailer 8
-
$2,116 USD
View
B
Retailer 9
-
$2,566 USD
View
B
Retailer 10
-
$2,755 USD
View
B
Retailer 11
-
$2,951 USD
View
B
Retailer 12
-
$3,048 USD
View
Most Expensive
B
MOH London
LG407945468 · Nov 5
$4,632 USD
£3,647 GBP
View
12 more retailers have this diamond
Prices start from $600 USDSave up to $4,032 USD

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
$600 USD