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Marquise|Natural|GIA

0.51ct I SI1 Marquise Natural Diamond

EX • I/SI1 • GIA 5556998671

Certificate GIA 5556998671

Diamond specifications and retailer prices

From $785 AUD
HK$4,300 HKD
As of November 1, 2026
Save $1,384 AUD (64%) vs most expensive(unlock to see where)
11 retailers carry this diamond
Most expensive: $2,169 AUD at MOH London · As of October 29, 2026
View at MOH London

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 5556998671. Listed at 11 retailers as of October 29, 2026, with prices from $785 to $2,169, a $1,384 spread on the same certified stone. MOH London lists it at $2,169. 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
FluorescenceFaint
OriginNatural
Grading LabGIA
CertificateGIA 5556998671
Dimensions7.90 × 4.12 × 2.61 mm
L/W Ratio1.92
Key to symbols
Twinning Wisp, Feather
Top View
7.90 mm4.12 mm0.51 ctI / SI1
OriginNatural
CutExcellent
PolishVery Good
SymmetryVery Good
FluorescenceFaint
CertificateGIA 5556998671
Side View
Table 61.0%CrownGirdle: MD-ETKPavilionCulet: NoneDepth 63.4%

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 1
Current: $2,169 AUD|Low: $767 AUD|High: $2,256 AUD|Avg: $1,264 AUD|-2.8%
MOH London
Retailer 2
Retailer 3
Retailer 4
Retailer 5
Retailer 6
Retailer 7
Retailer 8
Retailer 9
Retailer 10
Retailer 11
November 3, 2026
Retailer 7$785 AUD
Retailer 6$935 AUD
Retailer 8$949 AUD
Retailer 11$971 AUD
Retailer 9$1,110 AUD
Retailer 10$1,123 AUD
Retailer 2$1,152 AUD
Retailer 4$1,372 AUD
Retailer 5$1,443 AUD
Retailer 3$1,452 AUD
MOH London$2,169 AUD

42 data points across 11 retailers

11 retailers$785 AUD to $2,169 AUD

A
Cheapest Retailer
-
$785 AUD
HK$4,300 HKD
A
Retailer 2
-
$935 AUD
$655 USD
View
Retailer 3
-
$949 AUD
$665 USD
View
Price last confirmed 15 days ago
B+
Retailer 4
-
$971 AUD
SGD 920 SGD
View
B+
Retailer 5
-
$1,110 AUD
$778 USD
View
B
Retailer 6
-
$1,123 AUD
$787 USD
View
B+
Retailer 7
-
$1,152 AUD
£636 GBP
View
B
Retailer 8
-
$1,372 AUD
€916 EUR
View
B
Retailer 9
-
$1,443 AUD
ZAR 16,334 ZAR
View
Retailer 10
-
$1,452 AUD
View
Price last confirmed 30 days ago
Most Expensive
B
MOH London
83146B0B4 · Oct 29
$2,169 AUD
£1,197 GBP
View
10 more retailers have this diamond
Prices start from $785 AUDSave up to $1,384 AUD

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
$785 AUD