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Round|Natural|GIA

0.51ct K SI2 Round Natural Diamond

EX • K/SI2 • GIA 1403359121

Certificate GIA 1403359121

Diamond specifications and retailer prices

From $698 CAD
As of November 4, 2026
Save $898 CAD (56%) vs most expensive(unlock to see where)
12 retailers carry this diamond
Most expensive: $2,652 CAD at NZ Jewellers · As of September 24, 2026
View at NZ Jewellers

About this 0.51ct natural round diamond

This 0.51ct natural round sits in the half to three-quarter carat band, graded K colour (faint-tinted) and SI2 clarity (slightly-included), with a top-tier cut grade and certified by GIA 1403359121. Listed at 12 retailers as of November 4, 2026, with a 129% 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

0.51
Carat
K
Color
SI2
Clarity
Excellent
Cut

Specifications

CutExcellent
PolishExcellent
SymmetryExcellent
FluorescenceStrong
Crown angle36°
Pavilion angle40.8°
OriginNatural
Grading LabGIA
CertificateGIA 1403359121
Dimensions5.09 × 5.06 × 3.21 mm
L/W Ratio1.01
Star length50%
Lower girdle80%
Top View
5.09 mm5.06 mm0.51 ctK / SI2
OriginNatural
CutExcellent
PolishExcellent
SymmetryExcellent
FluorescenceStrong
CertificateGIA 1403359121
Side View
Table 55.0%Crown 36°Girdle: THN-THKPavilion 40.8°Culet: NoneDepth 63.2%

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 4
Current: $730 CAD|Low: $698 CAD|High: $1,617 CAD|Avg: $915 CAD|-1.3%
Retailer 1
Retailer 2
Retailer 3
Retailer 4
Retailer 5
Retailer 6
Retailer 7
Retailer 8
Retailer 9
Retailer 10
November 6, 2026
Retailer 6$698 CAD
Retailer 1$730 CAD
Retailer 9$736 CAD
Retailer 8$746 CAD
Retailer 10$767 CAD
Retailer 3$852 CAD
Retailer 4$869 CAD
Retailer 2$940 CAD
Retailer 5$1,031 CAD
Retailer 7$1,596 CAD

39 data points across 10 retailers

12 retailers$698 CAD to $1,596 CAD

Retailer 1
-
$691 CAD
Price last confirmed 44 days ago
Retailer 2
-
$691 CAD
View
Price last confirmed 36 days ago
A
Retailer 3
-
$698 CAD
View
A
Retailer 4
-
$730 CAD
View
B+
Retailer 5
-
$736 CAD
View
Retailer 6
-
$799 CAD
View
Price last confirmed 44 days ago
B+
Retailer 7
-
$852 CAD
View
B+
Retailer 8
-
$869 CAD
View
B
Retailer 9
-
$940 CAD
View
B
Retailer 10
-
$1,031 CAD
View
B
Retailer 11
-
$1,596 CAD
View
Most Expensive
NZ Jewellers
7b311409-20ed-4b64-85b2-5f0df2c37e1d · Sep 24
$2,652 CAD
$1,899 USD
View
Price last confirmed 42 days ago
11 more retailers have this diamond
Prices start from $698 CADSave up to $898 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
0.51ct Round
$698 CAD