Round|Natural|GIA

0.51ct I SI1 Round Natural Diamond

EX • I/SI1 • GIA 2556603477

Certificate GIA 2556603477

Diamond specifications and retailer prices

From HK$4,017 HKD
$512 USD
As of November 2, 2026
Save HK$12,496 HKD (76%) vs most expensive(unlock to see where)
21 retailers carry this diamond
Most expensive: HK$17,974 HKD at NZ Jewellers · As of October 17, 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 I colour (near-colourless) and SI1 clarity (slightly-included), with a top-tier cut grade and certified by GIA 2556603477. Listed at 21 retailers as of October 30, 2026, with a 311% 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
I
Colour
SI1
Clarity
Excellent
Cut

Specifications

CutExcellent
PolishExcellent
SymmetryExcellent
FluorescenceNone
Crown angle34.5°
Pavilion angle41.6°
OriginNatural
Grading LabGIA
CertificateGIA 2556603477
Dimensions5.06 × 5.10 × 3.16 mm
L/W Ratio1.01
Culet sizeNone
Key to symbols
Cloud
Top View
5.06 mm5.10 mm0.51 ctI / SI1
OriginNatural
CutExcellent
PolishExcellent
SymmetryExcellent
FluorescenceNone
CertificateGIA 2556603477
Side View
Table 61.0%Crown 34.5°Girdle: Slightly ThickPavilion 41.6°Culet: NoneDepth 62.3%

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 2
Current: HK$6,841 HKD|Low: HK$3,648 HKD|High: HK$10,622 HKD|Avg: HK$7,502 HKD|+5.8%
Retailer 1
Retailer 2
Retailer 3
Retailer 4
Retailer 5
Retailer 6
Retailer 7
Retailer 8
Retailer 9
November 2, 2026
Retailer 7HK$4,017 HKD
Retailer 6HK$6,630 HKD
Retailer 1HK$6,841 HKD
Retailer 2HK$7,414 HKD
Retailer 3HK$7,417 HKD
Retailer 9HK$8,011 HKD
Retailer 8HK$8,619 HKD
Retailer 5HK$8,847 HKD
Retailer 4HK$10,502 HKD

42 data points across 9 retailers

21 retailersHK$4,017 HKD to HK$16,513 HKD

A
Cheapest Retailer
-
HK$4,017 HKD
$512 USD
Final sale: no returns
Retailer 2
-
HK$5,100 HKD
$650 USD
View
Price last confirmed 12 days ago
Retailer 3
-
HK$5,194 HKD
$662 USD
View
Price last confirmed 17 days ago
Retailer 4
-
HK$5,194 HKD
$662 USD
View
Price last confirmed 63 days ago
B+
Retailer 5
-
HK$5,319 HKD
$678 USD
View
Retailer 6
-
HK$5,390 HKD
$687 USD
View
Price last confirmed 17 days ago
Retailer 7
-
HK$5,994 HKD
$764 USD
View
Price last confirmed 41 days ago
B+
Retailer 8
-
HK$6,049 HKD
$771 USD
View
B+
Retailer 9
-
HK$6,371 HKD
$812 USD
View
B
Retailer 10
-
HK$6,630 HKD
$845 USD
View
B
Retailer 11
-
HK$6,841 HKD
£687 GBP
View
B
Retailer 12
-
HK$6,882 HKD
$877 USD
View
B+
Retailer 13
-
HK$7,281 HKD
$928 USD
View
B+
Retailer 14
-
HK$7,414 HKD
€900 EUR
View
B+
Retailer 15
-
HK$7,417 HKD
£744 GBP
View
B
Retailer 16
-
HK$8,011 HKD
$1,021 USD
View
Retailer 17
-
HK$8,619 HKD
A$1,690 AUD
View
Price last confirmed 29 days ago
B
Retailer 18
-
HK$8,847 HKD
ZAR 18,217 ZAR
View
B
Retailer 19
-
HK$10,502 HKD
£1,054 GBP
View
B
Retailer 20
-
HK$16,513 HKD
CA$2,923 CAD
View
Most Expensive
NZ Jewellers
9d058924-124d-4d64-be57-fd7bf0c3d098 · Oct 17
HK$17,974 HKD
$2,291 USD
View
Price under review
20 more retailers have this diamond
Prices start from HK$4,017 HKDSave up to HK$12,496 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$4,017 HKD