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Marquise|Natural|GIA

0.51ct I SI1 Marquise Natural Diamond

EX • I/SI1 • GIA 6555746979

Certificate GIA 6555746979

Diamond specifications and retailer prices

From HK$2,840 HKD
$362 USD
As of November 2, 2026
Save HK$10,090 HKD (78%) vs most expensive(unlock to see where)
21 retailers carry this diamond
Most expensive: HK$12,930 HKD at NZ Jewellers · As of October 17, 2026
View at NZ Jewellers

About this 0.51ct natural marquise diamond

This 0.51ct natural marquise 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 stated by the retailer rather than the lab and certified by GIA 6555746979. Listed at 21 retailers as of November 2, 2026, with a 355% 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 (retailer stated)

Specifications

Cut (retailer stated)Excellent
PolishVery Good
SymmetryVery Good
FluorescenceNone
OriginNatural
Grading LabGIA
CertificateGIA 6555746979
Dimensions7.94 × 4.07 × 2.61 mm
L/W Ratio1.95
Girdle conditionFaceted
Culet sizeNone
Key to symbols
Feather, Crystal, Cloud
Top View
7.94 mm4.07 mm0.51 ctI / SI1
OriginNatural
CutExcellent
PolishVery Good
SymmetryVery Good
FluorescenceNone
CertificateGIA 6555746979
Side View
Table 63.0%CrownGirdle: THK-VTKPavilionCulet: NoneDepth 64.2%

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 2
Current: HK$5,171 HKD|Low: HK$2,840 HKD|High: HK$9,636 HKD|Avg: HK$5,218 HKD|+4.9%
Retailer 1
Retailer 2
Retailer 3
Retailer 4
Retailer 5
Retailer 6
Retailer 7
Retailer 8
Retailer 9
Retailer 10
Retailer 11
November 3, 2026
Retailer 11HK$2,840 HKD
Retailer 5HK$3,042 HKD
Retailer 3HK$4,127 HKD
Retailer 4HK$4,127 HKD
Retailer 9HK$4,441 HKD
Retailer 1HK$5,171 HKD
Retailer 10HK$5,688 HKD
Retailer 7HK$6,154 HKD
Retailer 2HK$6,200 HKD
Retailer 8HK$6,364 HKD
Retailer 6HK$9,526 HKD

37 data points across 11 retailers

21 retailersHK$2,840 HKD to HK$12,930 HKD

A
Cheapest Retailer
-
HK$2,840 HKD
$362 USD
Final sale: no returns
A
Retailer 2
-
HK$3,042 HKD
₹36,928 INR
View
Retailer 3
-
HK$4,127 HKD
$526 USD
View
Price last confirmed 35 days ago
A
Retailer 4
-
HK$4,127 HKD
$526 USD
View
Retailer 5
-
HK$4,127 HKD
$526 USD
View
Price last confirmed 15 days ago
A
Retailer 6
-
HK$4,127 HKD
$526 USD
View
Retailer 7
-
HK$4,441 HKD
$566 USD
View
Price last confirmed 17 days ago
A
Retailer 8
-
HK$4,441 HKD
$566 USD
View
Retailer 9
-
HK$4,441 HKD
$566 USD
View
Price last confirmed 18 days ago
Retailer 10
-
HK$4,755 HKD
$606 USD
View
Price last confirmed 35 days ago
Retailer 11
-
HK$4,755 HKD
$606 USD
View
Price last confirmed 24 days ago
B+
Retailer 12
-
HK$5,155 HKD
$657 USD
View
B+
Retailer 13
-
HK$5,171 HKD
£519 GBP
View
B+
Retailer 14
-
HK$5,688 HKD
$725 USD
View
B+
Retailer 15
-
HK$6,154 HKD
€747 EUR
View
Retailer 16
-
HK$6,200 HKD
A$1,216 AUD
View
Price last confirmed 30 days ago
B+
Retailer 17
-
HK$6,364 HKD
ZAR 13,104 ZAR
View
B
Retailer 18
-
HK$9,526 HKD
£956 GBP
View
Retailer 19
-
HK$12,930 HKD
$1,648 USD
View
Price last confirmed 35 days ago
B
Retailer 20
-
HK$12,930 HKD
$1,648 USD
View
Most Expensive
NZ Jewellers
27bca978-5464-459d-9f2b-309afb09e2c7 · Oct 17
HK$12,930 HKD
$1,648 USD
View
Price last confirmed 16 days ago
20 more retailers have this diamond
Prices start from HK$2,840 HKDSave up to HK$10,090 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 Marquise
HK$2,840 HKD