Radiant|Lab Grown|IGI

1.23ct G SI1 Radiant Lab Grown Diamond

ID • G/SI1 • IGI LG514255275

Shape and cutting style on the report: Cut cornered rectangular modified brilliant

Certificate IGI LG514255275

Diamond specifications and retailer prices

From $670 USD
As of October 31, 2026
Save $709 USD (51%) vs most expensive(unlock to see where)
13 retailers carry this diamond
Most expensive: $2,392 USD at NZ Jewellers · As of November 1, 2026
View at NZ Jewellers

About this 1.23ct lab-grown radiant diamond

This 1.23ct lab-grown radiant sits in the classic one-carat band, graded G colour (near-colourless) and SI1 clarity (slightly-included), with a top-tier cut grade and certified by IGI LG514255275 or 514255275. Listed at 13 retailers as of October 31, 2026, with a 106% spread between the cheapest and most expensive listing. That is exactly the kind of price-discovery gap Carat Hunter was built to surface. 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
G
Color
SI1
Clarity
Ideal
Cut

Specifications

CutIdeal
PolishExcellent
SymmetryExcellent
FluorescenceNone
Crown angle41.2°
Pavilion angle32.3°
OriginLab Grown
Grading LabIGI
CertificateIGI LG514255275
Dimensions7.25 × 5.53 × 3.53 mm
L/W Ratio1.31
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
7.25 mm5.53 mm1.23 ctG / SI1
OriginLab Grown
CutIdeal
PolishExcellent
SymmetryExcellent
FluorescenceNone
CertificateIGI LG514255275
Side View
Table 61.5%Crown 41.2°Girdle: Slightly ThickPavilion 32.3°Culet: NoneDepth 63.8%

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: Oct 31
Current: $1,366 USD|Low: $670 USD|High: $3,386 USD|Avg: $1,535 USD|+2.1%
Retailer 1
Retailer 2
Retailer 3
Retailer 4
Retailer 5
Retailer 6
Retailer 7
Retailer 8
Retailer 9
Retailer 10
November 1, 2026
Retailer 3$670 USD
Retailer 7$733 USD
Retailer 10$820 USD
Retailer 8$851 USD
Retailer 4$1,030 USD
Retailer 1$1,366 USD
Retailer 9$1,379 USD
Retailer 6$2,096 USD
Retailer 2$2,655 USD
Retailer 5$3,345 USD

40 data points across 10 retailers

13 retailers$670 USD to $1,379 USD

B+
Cheapest Retailer
-
$670 USD
B
Retailer 2
-
$733 USD
View
B
Retailer 3
-
$798 USD
View
B
Retailer 4
-
$820 USD
View
Final sale: no returns
B
Retailer 5
-
$851 USD
View
Retailer 6
-
$851 USD
View
Price last confirmed 21 days ago
B
Retailer 7
-
$1,030 USD
View
B
Retailer 8
-
$1,366 USD
£1,075 GBP
View
B
Retailer 9
-
$1,379 USD
View
Retailer 10
-
$2,096 USD
View
Price under review
Most Expensive
NZ Jewellers
608f19aa-4b90-4042-a34e-5575f5ee5aa6 · Nov 1
$2,392 USD
View
Price under review
10 more retailers have this diamond
Prices start from $670 USDSave up to $709 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.

B+
1.23ct Radiant
$670 USD