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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 HK$3,923 HKD
As of November 4, 2026
Save HK$5,044 HKD (56%) vs most expensive(unlock to see where)
12 retailers carry this diamond
Most expensive: HK$14,898 HKD 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
Colour
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
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See the detailed 0 to 100 score with Quality, Value, Certification & Market breakdown

Price History

Last verified: Nov 4
Current: HK$4,103 HKD|Low: HK$3,923 HKD|High: HK$9,085 HKD|Avg: HK$5,142 HKD|-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 6HK$3,923 HKD
Retailer 1HK$4,103 HKD
Retailer 9HK$4,134 HKD
Retailer 8HK$4,189 HKD
Retailer 10HK$4,307 HKD
Retailer 3HK$4,786 HKD
Retailer 4HK$4,880 HKD
Retailer 2HK$5,280 HKD
Retailer 5HK$5,790 HKD
Retailer 7HK$8,967 HKD

39 data points across 10 retailers

12 retailersHK$3,923 HKD to HK$8,967 HKD

Retailer 1
-
HK$3,883 HKD
Price last confirmed 44 days ago
Retailer 2
-
HK$3,883 HKD
View
Price last confirmed 36 days ago
A
Retailer 3
-
HK$3,923 HKD
View
A
Retailer 4
-
HK$4,103 HKD
View
B+
Retailer 5
-
HK$4,134 HKD
View
Retailer 6
-
HK$4,487 HKD
View
Price last confirmed 44 days ago
B+
Retailer 7
-
HK$4,786 HKD
View
B+
Retailer 8
-
HK$4,880 HKD
View
B
Retailer 9
-
HK$5,280 HKD
View
B
Retailer 10
-
HK$5,790 HKD
View
B
Retailer 11
-
HK$8,967 HKD
View
Most Expensive
NZ Jewellers
7b311409-20ed-4b64-85b2-5f0df2c37e1d · Sep 24
HK$14,898 HKD
$1,899 USD
View
Price last confirmed 43 days ago
11 more retailers have this diamond
Prices start from HK$3,923 HKDSave up to HK$5,044 HKD

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
HK$3,923 HKD