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Marquise|Natural|GIA

0.51ct I SI2 Marquise Natural Diamond

EX • I/SI2 • GIA 1553998649

Certificate GIA 1553998649

Diamond specifications and retailer prices

From $707 AUD
As of November 6, 2026
Save $1,942 AUD (73%) vs most expensive(unlock to see where)
15 retailers carry this diamond
Most expensive: $2,649 AUD at NZ Jewellers · As of November 5, 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 SI2 clarity (slightly-included), with a top-tier cut grade stated by the retailer rather than the lab and certified by GIA 1553998649. Listed at 15 retailers as of November 5, 2026, with prices from $707 to $2,649, a $1,942 spread on the same certified stone. NZ Jewellers lists it at $2,649. 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
SI2
Clarity
Excellent
Cut (retailer stated)

Specifications

Cut (retailer stated)Excellent
PolishVery Good
SymmetryVery Good
FluorescenceMedium
OriginNatural
Grading LabGIA
CertificateGIA 1553998649
Dimensions8.72 × 4.07 × 2.52 mm
L/W Ratio2.14
Key to symbols
Twinning Wisp, Feather
Top View
8.72 mm4.07 mm0.51 ctI / SI2
OriginNatural
CutExcellent
PolishVery Good
SymmetryVery Good
FluorescenceMedium
CertificateGIA 1553998649
Side View
Table 55.0%CrownGirdle: STK-THKPavilionCulet: NoneDepth 61.9%

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 6
Current: $2,649 AUD|Low: $688 AUD|High: $2,649 AUD|Avg: $1,114 AUD|+3.6%
NZ Jewellers
Retailer 2
Retailer 3
Retailer 4
Retailer 5
Retailer 6
Retailer 7
Retailer 8
Retailer 9
Retailer 10
Retailer 11
Retailer 12
Retailer 13
Retailer 14
Retailer 15
November 6, 2026
Retailer 4$707 AUD
Retailer 3$779 AUD
Retailer 9$844 AUD
Retailer 15$859 AUD
Retailer 6$879 AUD
Retailer 10$910 AUD
Retailer 14$910 AUD
Retailer 7$975 AUD
Retailer 13$975 AUD
Retailer 2$1,003 AUD
Retailer 8$1,026 AUD
Retailer 5$1,039 AUD
Retailer 11$1,246 AUD
Retailer 12$1,949 AUD
NZ Jewellers$2,649 AUD

30 data points across 15 retailers

15 retailers$707 AUD to $2,649 AUD

A
Cheapest Retailer
-
$707 AUD
A
Retailer 2
-
$779 AUD
View
Final sale: no returns
A
Retailer 3
-
$844 AUD
View
Retailer 4
-
$859 AUD
View
Price last confirmed 20 days ago
Retailer 5
-
$879 AUD
View
Price last confirmed 11 days ago
B+
Retailer 6
-
$910 AUD
View
Retailer 7
-
$910 AUD
View
Price last confirmed 9 days ago
B+
Retailer 8
-
$975 AUD
View
Retailer 9
-
$975 AUD
View
Price last confirmed 20 days ago
B+
Retailer 10
-
$1,003 AUD
View
B+
Retailer 11
-
$1,026 AUD
View
B+
Retailer 12
-
$1,039 AUD
View
B
Retailer 13
-
$1,246 AUD
View
B
Retailer 14
-
$1,949 AUD
View
Most Expensive
B
NZ Jewellers
8c553993-763c-4d33-980b-770d3b9d2d4f · Nov 5
$2,649 AUD
$1,820 USD
View
14 more retailers have this diamond
Prices start from $707 AUDSave up to $1,942 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
$707 AUD