Round|Natural|GIA

1.23ct E SI1 Round Natural Diamond

EX • E/SI1 • GIA 1565135099

Certificate GIA 1565135099

Diamond specifications and retailer prices

From €3,448 EUR
As of November 5, 2026
Save €578 EUR (14%) vs most expensive(unlock to see where)
9 retailers carry this diamond
Most expensive: €6,221 EUR 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
Colour
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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Price History

Last verified: Nov 5
Current: €6,221 EUR|Low: €3,403 EUR|High: €6,251 EUR|Avg: €4,228 EUR|-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€3,403 EUR
Retailer 9€3,448 EUR
Retailer 3€3,454 EUR
Retailer 6€3,571 EUR
Retailer 7€3,571 EUR
Retailer 8€3,828 EUR
Retailer 2€4,026 EUR
Retailer 5€5,978 EUR
NZ Jewellers€6,221 EUR

28 data points across 9 retailers

9 retailers€3,448 EUR to €4,026 EUR

Retailer 1
-
€3,403 EUR
Price last confirmed 9 days ago
B+
Retailer 2
-
€3,448 EUR
View
Retailer 3
-
€3,454 EUR
View
Price last confirmed 9 days ago
Retailer 4
-
€3,571 EUR
View
Price last confirmed 11 days ago
Retailer 5
-
€3,571 EUR
View
Price last confirmed 12 days ago
Retailer 6
-
€3,828 EUR
View
Price last confirmed 33 days ago
B+
Retailer 7
-
€4,026 EUR
View
Retailer 8
-
€5,978 EUR
View
Price last confirmed 11 days ago
Most Expensive
NZ Jewellers
f2159c02-59d5-4fbc-86aa-12c7fd592421 · Oct 27
€6,221 EUR
$6,982 USD
View
Price last confirmed 10 days ago
8 more retailers have this diamond
Prices start from €3,448 EURSave up to €578 EUR

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
€3,448 EUR