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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 $3,408 SGD
As of November 6, 2026
Save $4,557 SGD (57%) vs most expensive(unlock to see where)
21 retailers carry this diamond
Most expensive: $7,965 SGD 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 $3,408 to $7,965, a $4,557 spread on the same certified stone. NZ Jewellers lists it at $7,965. 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: $3,408 SGD|Low: $3,408 SGD|High: $7,725 SGD|Avg: $4,909 SGD|-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$3,408 SGD
Retailer 7$3,412 SGD
Retailer 9$3,928 SGD
Retailer 2$4,374 SGD
Retailer 3$4,702 SGD
Retailer 8$4,876 SGD
Retailer 4$5,311 SGD
Retailer 5$5,580 SGD
Retailer 6$7,624 SGD

26 data points across 9 retailers

21 retailers$3,408 SGD to $7,965 SGD

A
Cheapest Retailer
-
$3,408 SGD
A
Retailer 2
-
$3,412 SGD
View
A
Retailer 3
-
$3,928 SGD
View
A
Retailer 4
-
$4,059 SGD
View
A
Retailer 5
-
$4,219 SGD
View
Final sale: no returns
A
Retailer 6
-
$4,374 SGD
View
A
Retailer 7
-
$4,396 SGD
View
Retailer 8
-
$4,571 SGD
View
Price last confirmed 8 days ago
B+
Retailer 9
-
$4,571 SGD
View
A
Retailer 10
-
$4,702 SGD
View
B+
Retailer 11
-
$4,746 SGD
View
B+
Retailer 12
-
$4,747 SGD
View
B+
Retailer 13
-
$4,757 SGD
View
B+
Retailer 14
-
$4,876 SGD
View
Retailer 15
-
$4,896 SGD
View
Price last confirmed 29 days ago
B+
Retailer 16
-
$5,275 SGD
View
B+
Retailer 17
-
$5,311 SGD
View
B+
Retailer 18
-
$5,580 SGD
View
B
Retailer 19
-
$7,624 SGD
View
Retailer 20
-
$7,764 SGD
View
Price last confirmed 66 days ago
Most Expensive
B
NZ Jewellers
3a3018ef-e528-4962-97d6-8518516e0f75 · Nov 5
$7,965 SGD
$6,215 USD
View
20 more retailers have this diamond
Prices start from $3,408 SGDSave up to $4,557 SGD

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
$3,408 SGD