Round|Natural|GIA

0.51ct I SI1 Round Natural Diamond

EX • I/SI1 • GIA 1559729598

Certificate GIA 1559729598

Diamond specifications and retailer prices

From HK$3,844 HKD
$490 USD
As of November 2, 2026
Save HK$11,965 HKD (76%) vs most expensive(unlock to see where)
21 retailers carry this diamond
Most expensive: HK$17,237 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 1559729598. 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°
Pavilion angle41.6°
OriginNatural
Grading LabGIA
CertificateGIA 1559729598
Dimensions5.08 × 5.12 × 3.18 mm
L/W Ratio1.01
Culet sizeNone
Key to symbols
Crystal, Cloud
Top View
5.08 mm5.12 mm0.51 ctI / SI1
OriginNatural
CutExcellent
PolishExcellent
SymmetryExcellent
FluorescenceNone
CertificateGIA 1559729598
Side View
Table 60.0%Crown 34°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$7,111 HKD|Low: HK$3,844 HKD|High: HK$12,844 HKD|Avg: HK$7,761 HKD|-1.2%
Retailer 1
Retailer 2
Retailer 3
Retailer 4
Retailer 5
Retailer 6
Retailer 7
Retailer 8
November 2, 2026
Retailer 7HK$3,844 HKD
Retailer 5HK$6,433 HKD
Retailer 2HK$6,754 HKD
Retailer 1HK$7,111 HKD
Retailer 3HK$7,324 HKD
Retailer 8HK$8,264 HKD
Retailer 6HK$8,483 HKD
Retailer 4HK$12,694 HKD

39 data points across 8 retailers

21 retailersHK$3,844 HKD to HK$15,809 HKD

A
Cheapest Retailer
-
HK$3,844 HKD
$490 USD
Final sale: no returns
Retailer 2
-
HK$4,982 HKD
$635 USD
View
Price last confirmed 63 days ago
A
Retailer 3
-
HK$5,115 HKD
$652 USD
View
Retailer 4
-
HK$5,178 HKD
$660 USD
View
Price last confirmed 13 days ago
Retailer 5
-
HK$5,359 HKD
$683 USD
View
Price last confirmed 17 days ago
B+
Retailer 6
-
HK$5,359 HKD
$683 USD
View
Retailer 7
-
HK$5,743 HKD
$732 USD
View
Price last confirmed 41 days ago
B+
Retailer 8
-
HK$5,843 HKD
$745 USD
View
B+
Retailer 9
-
HK$6,096 HKD
$777 USD
View
B
Retailer 10
-
HK$6,433 HKD
$820 USD
View
B+
Retailer 11
-
HK$6,587 HKD
$840 USD
View
B
Retailer 12
-
HK$6,754 HKD
£678 GBP
View
B
Retailer 13
-
HK$6,967 HKD
$888 USD
View
B+
Retailer 14
-
HK$7,111 HKD
£714 GBP
View
B+
Retailer 15
-
HK$7,324 HKD
€889 EUR
View
B
Retailer 16
-
HK$7,667 HKD
$977 USD
View
Retailer 17
-
HK$8,264 HKD
A$1,621 AUD
View
Price last confirmed 28 days ago
B
Retailer 18
-
HK$8,483 HKD
ZAR 17,467 ZAR
View
B
Retailer 19
-
HK$12,694 HKD
£1,274 GBP
View
B
Retailer 20
-
HK$15,809 HKD
CA$2,799 CAD
View
Most Expensive
NZ Jewellers
d4e6bbfb-beed-4788-8c9c-e8df94596517 · Oct 17
HK$17,237 HKD
$2,197 USD
View
Price last confirmed 16 days ago
20 more retailers have this diamond
Prices start from HK$3,844 HKDSave up to HK$11,965 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$3,844 HKD