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Round|Natural|GIA

1.28ct I SI1 Round Natural Diamond

EX • I/SI1 • GIA 3555600029

Certificate GIA 3555600029

Diamond specifications and retailer prices

From €2,382 EUR
As of November 6, 2026
Save €3,185 EUR (57%) vs most expensive(unlock to see where)
21 retailers carry this diamond
Most expensive: €5,567 EUR at NZ Jewellers · As of November 5, 2026
View at NZ Jewellers

About this 1.28ct natural round diamond

This 1.28ct natural round sits in the one-and-a-quarter to one-and-a-half carat band, graded I colour (near-colourless) and SI1 clarity (slightly-included), with a top-tier cut grade and certified by GIA 3555600029. Listed at 21 retailers as of November 5, 2026, with prices from €2,382 to €5,567, a €3,185 spread on the same certified stone. NZ Jewellers lists it at €5,567. 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

1.28
Carat
I
Colour
SI1
Clarity
Excellent
Cut

Specifications

CutExcellent
PolishExcellent
SymmetryExcellent
FluorescenceNone
Crown angle35°
Pavilion angle40.8°
OriginNatural
Grading LabGIA
CertificateGIA 3555600029
Dimensions6.94 × 6.97 × 4.27 mm
L/W Ratio1.00
Culet sizeNone
Key to symbols
Twinning Wisp, Cloud, Crystal, Feather, Needle, Indented Natural
Top View
6.94 mm6.97 mm1.28 ctI / SI1
OriginNatural
CutExcellent
PolishExcellent
SymmetryExcellent
FluorescenceNone
CertificateGIA 3555600029
Side View
Table 58.0%Crown 35°Girdle: MED-STKPavilion 40.8°Culet: NoneDepth 61.4%

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: €2,382 EUR|Low: €2,382 EUR|High: €5,399 EUR|Avg: €3,431 EUR|-2.4%
Retailer 1
Retailer 2
Retailer 3
Retailer 4
Retailer 5
Retailer 6
Retailer 7
Retailer 8
Retailer 9
November 6, 2026
Retailer 1€2,382 EUR
Retailer 7€2,384 EUR
Retailer 9€2,745 EUR
Retailer 2€3,057 EUR
Retailer 3€3,286 EUR
Retailer 8€3,408 EUR
Retailer 4€3,712 EUR
Retailer 5€3,900 EUR
Retailer 6€5,328 EUR

26 data points across 9 retailers

21 retailers€2,382 EUR to €5,567 EUR

A
Cheapest Retailer
-
€2,382 EUR
A
Retailer 2
-
€2,384 EUR
View
A
Retailer 3
-
€2,745 EUR
View
A
Retailer 4
-
€2,837 EUR
View
A
Retailer 5
-
€2,949 EUR
View
Final sale: no returns
A
Retailer 6
-
€3,057 EUR
View
A
Retailer 7
-
€3,072 EUR
View
Retailer 8
-
€3,195 EUR
View
Price last confirmed 8 days ago
B+
Retailer 9
-
€3,195 EUR
View
A
Retailer 10
-
€3,286 EUR
View
B+
Retailer 11
-
€3,317 EUR
View
B+
Retailer 12
-
€3,318 EUR
View
B+
Retailer 13
-
€3,325 EUR
View
B+
Retailer 14
-
€3,408 EUR
View
Retailer 15
-
€3,421 EUR
View
Price last confirmed 29 days ago
B+
Retailer 16
-
€3,687 EUR
View
B+
Retailer 17
-
€3,712 EUR
View
B+
Retailer 18
-
€3,900 EUR
View
B
Retailer 19
-
€5,328 EUR
View
Retailer 20
-
€5,426 EUR
View
Price last confirmed 66 days ago
Most Expensive
B
NZ Jewellers
3a3018ef-e528-4962-97d6-8518516e0f75 · Nov 5
€5,567 EUR
$6,215 USD
View
20 more retailers have this diamond
Prices start from €2,382 EURSave up to €3,185 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
1.28ct Round
€2,382 EUR