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Round|Lab Grown|IGI

1.23ct G SI1 Round Lab Grown Diamond

ID • G/SI1 • IGI LG488131917

Shape and cutting style on the report: Round brilliant

Certificate IGI LG488131917

Diamond specifications and retailer prices

From $883 USD
As of November 1, 2026
Save $761 USD (46%) vs most expensive(unlock to see where)
12 retailers carry this diamond
Most expensive: $2,277 USD at Friendly Diamonds · As of October 30, 2026
View at Friendly Diamonds

About this 1.23ct lab-grown round diamond

This 1.23ct lab-grown round 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 LG488131917 or 488131917. Listed at 12 retailers as of November 1, 2026, with a 86% 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 angle34°
Pavilion angle41.2°
OriginLab Grown
Grading LabIGI
CertificateIGI LG488131917
Dimensions6.93 × 6.90 × 4.24 mm
L/W Ratio1.00
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
6.93 mm6.90 mm1.23 ctG / SI1
OriginLab Grown
CutIdeal
PolishExcellent
SymmetryExcellent
FluorescenceNone
CertificateIGI LG488131917
Side View
Table 57.5%Crown 34°Girdle: THN-MEDPavilion 41.2°Culet: NoneDepth 61.3%

Caratlytics Score

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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: Nov 1
Current: $2,277 USD|Low: $847 USD|High: $3,889 USD|Avg: $1,501 USD
Friendly Diamonds
Retailer 2
Retailer 3
Retailer 4
Retailer 5
Retailer 6
Retailer 7
Retailer 8
Retailer 9
Retailer 10
November 2, 2026
Retailer 4$883 USD
Retailer 5$930 USD
Retailer 8$988 USD
Retailer 6$1,024 USD
Retailer 9$1,024 USD
Retailer 10$1,200 USD
Retailer 2$1,570 USD
Retailer 7$1,644 USD
Friendly Diamonds$2,277 USD
Retailer 3$3,858 USD

41 data points across 10 retailers

12 retailers$883 USD to $1,644 USD

B
Cheapest Retailer
-
$883 USD
B
Retailer 2
-
$930 USD
View
B
Retailer 3
-
$960 USD
View
B
Retailer 4
-
$988 USD
View
Final sale: no returns
Retailer 5
-
$1,024 USD
View
Price last confirmed 20 days ago
B
Retailer 6
-
$1,024 USD
View
B
Retailer 7
-
$1,200 USD
View
B
Retailer 8
-
$1,570 USD
£1,236 GBP
View
B
Retailer 9
-
$1,644 USD
View
Most Expensive
Friendly Diamonds
1594928 · Oct 30
$2,277 USD
View
Price under review
9 more retailers have this diamond
Prices start from $883 USDSave up to $761 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 Round
$883 USD