Round|Natural|GIA

1.23ct G SI1 Round Natural Diamond

EX • G/SI1 • GIA 1519310807

Certificate GIA 1519310807

Diamond specifications and retailer prices

From $3,139 USD
As of November 4, 2026
Save $4,307 USD (58%) vs most expensive(unlock to see where)
6 retailers carry this diamond
Most expensive: $7,446 USD at Diamond Quarter · As of November 5, 2026
View at Diamond Quarter

About this 1.23ct natural round diamond

This 1.23ct natural 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 GIA 1519310807. Listed at 6 retailers as of November 4, 2026, with prices from $3,139 to $7,446, a $4,307 spread on the same certified stone. Diamond Quarter lists it at $7,446. 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
Excellent
Cut

Specifications

CutExcellent
PolishExcellent
SymmetryExcellent
FluorescenceMedium
Crown angle35.5°
Pavilion angle41.2°
OriginNatural
Grading LabGIA
CertificateGIA 1519310807
Dimensions6.79 × 6.84 × 4.30 mm
L/W Ratio1.01
Star length50%
Lower girdle80%
Key to symbols
Crystal, Cloud, Needle
Top View
6.79 mm6.84 mm1.23 ctG / SI1
OriginNatural
CutExcellent
PolishExcellent
SymmetryExcellent
FluorescenceMedium
CertificateGIA 1519310807
Side View
Table 56.0%Crown 35.5°Girdle: MED-STKPavilion 41.2°Culet: NoneDepth 63.1%

Caratlytics Score

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

Price History

Last verified: Nov 4
Current: $5,671 USD|Low: $2,480 USD|High: $5,925 USD|Avg: $4,321 USD|-1.3%
Retailer 1
Retailer 2
Retailer 3
Retailer 4
Retailer 5
November 4, 2026
Retailer 3$3,139 USD
Retailer 4$3,239 USD
Retailer 2$3,767 USD
Retailer 1$5,671 USD
Retailer 5$5,925 USD

22 data points across 5 retailers

6 retailers$3,139 USD to $7,446 USD

A
Cheapest Retailer
-
$3,139 USD
Final sale: no returns
A
Retailer 2
-
$3,239 USD
View
B+
Retailer 3
-
$3,767 USD
View
B
Retailer 4
-
$5,671 USD
View
B
Retailer 5
-
$5,925 USD
View
Most Expensive
B
Diamond Quarter
1.23SI1G1507B434N · Nov 5
$7,446 USD
£5,863 GBP
View
5 more retailers have this diamond
Prices start from $3,139 USDSave up to $4,307 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
$3,139 USD