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Round|Natural|GIA

1.00ct K SI1 Round Natural Diamond

EX • K/SI1 • GIA 2558715221

Certificate GIA 2558715221

Diamond specifications and retailer prices

From €1,376 EUR
As of November 6, 2026
Save €1,835 EUR (57%) vs most expensive(unlock to see where)
20 retailers carry this diamond
Most expensive: €3,842 EUR at NZ Jewellers · As of October 3, 2026
View at NZ Jewellers

About this 1ct natural round diamond

This 1ct natural round sits in the classic one-carat band, graded K colour (faint-tinted) and SI1 clarity (slightly-included), with a top-tier cut grade and certified by GIA 2558715221. Listed at 20 retailers as of November 4, 2026, with a 133% 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

1.00
Carat
K
Colour
SI1
Clarity
Excellent
Cut

Specifications

CutExcellent
PolishExcellent
SymmetryExcellent
FluorescenceNone
Crown angle33.5°
Pavilion angle41.8°
OriginNatural
Grading LabGIA
CertificateGIA 2558715221
Dimensions6.40 × 6.46 × 3.93 mm
L/W Ratio1.01
Girdle conditionFaceted
Culet sizeNone
Key to symbols
Crystal, Cloud, Feather
Top View
6.40 mm6.46 mm1.00 ctK / SI1
OriginNatural
CutExcellent
PolishExcellent
SymmetryExcellent
FluorescenceNone
CertificateGIA 2558715221
Side View
Table 61.0%Crown 33.5°Girdle: MED-STKPavilion 41.8°Culet: NoneDepth 61.1%

Caratlytics Score

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

Price History

Last verified: Nov 6
Current: €1,434 EUR|Low: €1,376 EUR|High: €3,258 EUR|Avg: €2,094 EUR|-3.1%
Retailer 1
Retailer 2
Retailer 3
Retailer 4
Retailer 5
Retailer 6
Retailer 7
Retailer 8
November 6, 2026
Retailer 7€1,376 EUR
Retailer 1€1,434 EUR
Retailer 5€1,694 EUR
Retailer 8€1,758 EUR
Retailer 2€1,985 EUR
Retailer 4€2,243 EUR
Retailer 3€2,491 EUR
Retailer 6€3,211 EUR

35 data points across 8 retailers

20 retailers€1,376 EUR to €3,211 EUR

A
Cheapest Retailer
-
€1,376 EUR
A
Retailer 2
-
€1,434 EUR
View
B+
Retailer 3
-
€1,694 EUR
View
B+
Retailer 4
-
€1,721 EUR
View
B+
Retailer 5
-
€1,724 EUR
View
B+
Retailer 6
-
€1,758 EUR
View
B+
Retailer 7
-
€1,836 EUR
View
Retailer 8
-
€1,838 EUR
View
Price last confirmed 39 days ago
Retailer 9
-
€1,838 EUR
View
Price last confirmed 28 days ago
Retailer 10
-
€1,838 EUR
View
Price last confirmed 25 days ago
B+
Retailer 11
-
€1,915 EUR
View
Retailer 12
-
€1,923 EUR
View
Price last confirmed 38 days ago
B+
Retailer 13
-
€1,961 EUR
View
B+
Retailer 14
-
€1,985 EUR
View
Retailer 15
-
€2,121 EUR
View
Price last confirmed 38 days ago
B+
Retailer 16
-
€2,243 EUR
View
B
Retailer 17
-
€2,491 EUR
View
B
Retailer 18
-
€3,211 EUR
View
Retailer 19
-
€3,842 EUR
View
Price last confirmed 39 days ago
Most Expensive
NZ Jewellers
7368ce97-3a06-415c-8add-e03809881242 · Oct 3
€3,842 EUR
$4,290 USD
View
Price last confirmed 34 days ago
19 more retailers have this diamond
Prices start from €1,376 EURSave up to €1,835 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.

A
1.00ct Round
€1,376 EUR