Round|Natural|GIA

1.23ct E SI1 Round Natural Diamond

EX • E/SI1 • GIA 1565135099

Certificate GIA 1565135099

Diamond specifications and retailer prices

From $3,870 USD
As of November 5, 2026
Save $649 USD (14%) vs most expensive(unlock to see where)
9 retailers carry this diamond
Most expensive: $6,982 USD at NZ Jewellers · As of October 27, 2026
View at NZ Jewellers

About this 1.23ct natural round diamond

This 1.23ct natural round sits in the classic one-carat band, graded E colour (colourless) and SI1 clarity (slightly-included), with a top-tier cut grade and certified by GIA 1565135099. Listed at 9 retailers as of October 30, 2026, with a relatively tight 17% spread, which is unusual at this carat range and suggests competitive pricing across the listings. 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
E
Color
SI1
Clarity
Excellent
Cut

Specifications

CutExcellent
PolishExcellent
SymmetryExcellent
FluorescenceMedium
Crown angle36°
Pavilion angle41°
OriginNatural
Grading LabGIA
CertificateGIA 1565135099
Dimensions6.78 × 6.83 × 4.24 mm
L/W Ratio1.01
Girdle conditionSlightly Thick
Key to symbols
Crystal, Feather
Top View
6.78 mm6.83 mm1.23 ctE / SI1
OriginNatural
CutExcellent
PolishExcellent
SymmetryExcellent
FluorescenceMedium
CertificateGIA 1565135099
Side View
Table 59.0%Crown 36°GirdlePavilion 41°CuletDepth 62.3%

Caratlytics Score

How it works →
B+
Very Good
Strong quality and value balance
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See the detailed 0 to 100 score with Quality, Value, Certification & Market breakdown

Price History

Last verified: Nov 5
Current: $6,982 USD|Low: $3,820 USD|High: $7,016 USD|Avg: $4,745 USD|-0.5%
NZ Jewellers
Retailer 2
Retailer 3
Retailer 4
Retailer 5
Retailer 6
Retailer 7
Retailer 8
Retailer 9
October 30, 2026
Retailer 4$3,820 USD
Retailer 9$3,870 USD
Retailer 3$3,877 USD
Retailer 6$4,008 USD
Retailer 7$4,008 USD
Retailer 8$4,297 USD
Retailer 2$4,519 USD
Retailer 5$6,710 USD
NZ Jewellers$6,982 USD

28 data points across 9 retailers

9 retailers$3,870 USD to $4,519 USD

Retailer 1
-
$3,820 USD
Price last confirmed 9 days ago
B+
Retailer 2
-
$3,870 USD
View
Retailer 3
-
$3,877 USD
View
Price last confirmed 9 days ago
Retailer 4
-
$4,008 USD
View
Price last confirmed 11 days ago
Retailer 5
-
$4,008 USD
View
Price last confirmed 12 days ago
Retailer 6
-
$4,297 USD
View
Price last confirmed 33 days ago
B+
Retailer 7
-
$4,519 USD
View
Retailer 8
-
$6,710 USD
View
Price last confirmed 11 days ago
Most Expensive
NZ Jewellers
f2159c02-59d5-4fbc-86aa-12c7fd592421 · Oct 27
$6,982 USD
View
Price last confirmed 10 days ago
8 more retailers have this diamond
Prices start from $3,870 USDSave up to $649 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
$3,870 USD