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4.51ct H SI1 Round Natural Diamond

EX • H/SI1 • GIA 6511140946

Certificate GIA 6511140946

Diamond specifications and retailer prices

From HK$685,357 HKD
$87,350 USD
As of October 30, 2026
Save HK$223,840 HKD (25%) vs most expensive(unlock to see where)
4 retailers carry this diamond
Most expensive: HK$909,197 HKD at Diamond Quarter · As of November 2, 2026
View at Diamond Quarter

About this 4.51ct natural round diamond

This 4.51ct natural round sits in the three to five carat band, graded H colour (near-colourless) and SI1 clarity (slightly-included), with a top-tier cut grade and certified by GIA 6511140946. Listed at 4 retailers as of October 30, 2026, with prices from HK$685,357 to HK$909,197, a HK$223,840 spread on the same certified stone. Diamond Quarter lists it at HK$909,197. 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

4.51
Carat
H
Colour
SI1
Clarity
Excellent
Cut

Specifications

CutExcellent
PolishExcellent
SymmetryExcellent
FluorescenceNone
Crown angle35°
Pavilion angle41.6°
OriginNatural
Grading LabGIA
CertificateGIA 6511140946
Dimensions10.53 × 10.45 × 6.62 mm
L/W Ratio1.01
Star length50%
Lower girdle80%
Top View
10.53 mm10.45 mm4.51 ctH / SI1
OriginNatural
CutExcellent
PolishExcellent
SymmetryExcellent
FluorescenceNone
CertificateGIA 6511140946
Side View
Table 58.0%Crown 35°Girdle: Slightly ThickPavilion 41.6°Culet: NoneDepth 63.1%

Caratlytics Score

How it works →
B
Good
Decent quality, room for better deals
Unlock full score analysis
See the detailed 0 to 100 score with Quality, Value, Certification & Market breakdown

Price History

Last verified: Oct 30
Current: HK$685,357 HKD|Low: HK$519,851 HKD|High: HK$714,154 HKD|Avg: HK$632,767 HKD
Retailer 1
Retailer 2
Retailer 3
Retailer 4
Retailer 5
Retailer 6
Retailer 7
Retailer 8
Retailer 9
Retailer 10
October 2, 2026
Retailer 5HK$519,851 HKD
Retailer 9HK$532,345 HKD
Retailer 8HK$596,390 HKD
Retailer 3HK$629,858 HKD
Retailer 10HK$637,166 HKD
Retailer 6HK$649,814 HKD
Retailer 1HK$685,357 HKD
Retailer 2HK$688,142 HKD
Retailer 7HK$700,884 HKD
Retailer 4HK$714,154 HKD

2 data points across 10 retailers

4 retailersHK$685,357 HKD to HK$909,197 HKD

Retailer 1
-
HK$532,345 HKD
$67,848 USD
Price last confirmed 50 days ago
Retailer 2
-
HK$649,814 HKD
$82,820 USD
View
Price last confirmed 45 days ago
B
Retailer 3
-
HK$685,357 HKD
$87,350 USD
View
Most Expensive
B
Diamond Quarter
4.51SI1H6546B9B4N · Nov 2
HK$909,197 HKD
£91,243 GBP
View
3 more retailers have this diamond
Prices start from HK$685,357 HKDSave up to HK$223,840 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.

B
4.51ct Round
HK$685,357 HKD