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Round|Natural|GIA

1.28ct I SI1 Round Natural Diamond

EX • I/SI1 • GIA 6515401647

Certificate GIA 6515401647

Diamond specifications and retailer prices

From $4,602 CAD
As of November 5, 2026
Save $2,251 CAD (33%) vs most expensive(unlock to see where)
5 retailers carry this diamond
Most expensive: $6,852 CAD at 77 Diamonds · As of November 6, 2026
View at 77 Diamonds

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 6515401647. Listed at 5 retailers as of November 5, 2026, with prices from $4,602 to $6,852, a $2,251 spread on the same certified stone. 77 Diamonds lists it at $6,852. 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
Color
SI1
Clarity
Excellent
Cut

Specifications

CutExcellent
PolishExcellent
SymmetryExcellent
FluorescenceNone
Crown angle36°
Pavilion angle40.8°
OriginNatural
Grading LabGIA
CertificateGIA 6515401647
Dimensions6.90 × 6.85 × 4.30 mm
L/W Ratio1.01
Star length50%
Lower girdle80%
Top View
6.90 mm6.85 mm1.28 ctI / SI1
OriginNatural
CutExcellent
PolishExcellent
SymmetryExcellent
FluorescenceNone
CertificateGIA 6515401647
Side View
Table 58.0%Crown 36°Girdle: MED-STKPavilion 40.8°Culet: NoneDepth 62.8%

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 5
Current: $6,852 CAD|Low: $4,602 CAD|High: $6,965 CAD|Avg: $5,212 CAD|+0.8%
77 Diamonds
Retailer 2
Retailer 3
Retailer 4
November 6, 2026
Retailer 4$4,602 CAD
Retailer 3$4,663 CAD
Retailer 2$4,674 CAD
77 Diamonds$6,852 CAD

32 data points across 4 retailers

5 retailers$4,602 CAD to $6,852 CAD

A
Cheapest Retailer
-
$4,602 CAD
A
Retailer 2
-
$4,663 CAD
View
A
Retailer 3
-
$4,674 CAD
View
A
Retailer 4
-
$4,889 CAD
View
Most Expensive
B
77 Diamonds
RBZMMCC8BAK · Nov 6
$6,852 CAD
£3,863 GBP
View
4 more retailers have this diamond
Prices start from $4,602 CADSave up to $2,251 CAD

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
$4,602 CAD