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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 $4,797 NZD
As of November 6, 2026
Save $6,415 NZD (57%) vs most expensive(unlock to see where)
21 retailers carry this diamond
Most expensive: $11,211 NZD 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 $4,797 to $11,211, a $6,415 spread on the same certified stone. NZ Jewellers lists it at $11,211. 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: $6,617 NZD|Low: $4,797 NZD|High: $10,874 NZD|Avg: $6,913 NZD|-0.6%
Retailer 1
Retailer 2
Retailer 3
Retailer 4
Retailer 5
Retailer 6
Retailer 7
Retailer 8
Retailer 9
November 7, 2026
Retailer 2$4,797 NZD
Retailer 7$4,802 NZD
Retailer 9$5,529 NZD
Retailer 3$6,157 NZD
Retailer 1$6,617 NZD
Retailer 8$6,864 NZD
Retailer 4$7,475 NZD
Retailer 5$7,854 NZD
Retailer 6$10,731 NZD

26 data points across 9 retailers

21 retailers$4,797 NZD to $11,211 NZD

A
Cheapest Retailer
-
$4,797 NZD
A
Retailer 2
-
$4,802 NZD
View
A
Retailer 3
-
$5,529 NZD
View
A
Retailer 4
-
$5,713 NZD
View
A
Retailer 5
-
$5,938 NZD
View
Final sale: no returns
A
Retailer 6
-
$6,157 NZD
View
A
Retailer 7
-
$6,187 NZD
View
Retailer 8
-
$6,435 NZD
View
Price last confirmed 9 days ago
B+
Retailer 9
-
$6,435 NZD
View
A
Retailer 10
-
$6,617 NZD
View
B+
Retailer 11
-
$6,680 NZD
View
B+
Retailer 12
-
$6,682 NZD
View
B+
Retailer 13
-
$6,696 NZD
View
B+
Retailer 14
-
$6,864 NZD
View
Retailer 15
-
$6,891 NZD
View
Price last confirmed 30 days ago
B+
Retailer 16
-
$7,425 NZD
View
B+
Retailer 17
-
$7,475 NZD
View
B+
Retailer 18
-
$7,854 NZD
View
B
Retailer 19
-
$10,731 NZD
View
Retailer 20
-
$10,928 NZD
View
Price last confirmed 67 days ago
Most Expensive
B
NZ Jewellers
3a3018ef-e528-4962-97d6-8518516e0f75 · Nov 5
$11,211 NZD
$6,215 USD
View
20 more retailers have this diamond
Prices start from $4,797 NZDSave up to $6,415 NZD

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
$4,797 NZD