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Marquise|Natural|GIA

0.51ct I SI1 Marquise Natural Diamond

EX • I/SI1 • GIA 2547681359

Certificate GIA 2547681359

Diamond specifications and retailer prices

From $785 AUD
HK$4,300 HKD
As of November 1, 2026
Save $1,366 AUD (63%) vs most expensive(unlock to see where)
19 retailers carry this diamond
Most expensive: $2,921 AUD at NZ Jewellers · As of November 3, 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 2547681359. Listed at 19 retailers as of November 1, 2026, with a 174% 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
PolishExcellent
SymmetryVery Good
FluorescenceFaint
OriginNatural
Grading LabGIA
CertificateGIA 2547681359
Dimensions8.18 × 4.16 × 2.67 mm
L/W Ratio1.97
Top View
8.18 mm4.16 mm0.51 ctI / SI1
OriginNatural
CutExcellent
PolishExcellent
SymmetryVery Good
FluorescenceFaint
CertificateGIA 2547681359
Side View
Table 59.0%CrownGirdle: THN-THKPavilionCulet: NoneDepth 64.3%

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 1
Current: $1,136 AUD|Low: $859 AUD|High: $2,176 AUD|Avg: $1,337 AUD|+5.6%
Retailer 1
Retailer 2
Retailer 3
Retailer 4
Retailer 5
Retailer 6
Retailer 7
Retailer 8
Retailer 9
November 3, 2026
Retailer 6$859 AUD
Retailer 8$1,104 AUD
Retailer 1$1,136 AUD
Retailer 5$1,199 AUD
Retailer 3$1,248 AUD
Retailer 9$1,342 AUD
Retailer 7$1,401 AUD
Retailer 4$1,438 AUD
Retailer 2$2,151 AUD

44 data points across 9 retailers

19 retailers$785 AUD to $2,151 AUD

A
Cheapest Retailer
-
$785 AUD
HK$4,300 HKD
A
Retailer 2
-
$859 AUD
$602 USD
View
Final sale: no returns
B+
Retailer 3
-
$932 AUD
$653 USD
View
B+
Retailer 4
-
$932 AUD
$653 USD
View
B+
Retailer 5
-
$967 AUD
$678 USD
View
B+
Retailer 6
-
$976 AUD
SGD 924 SGD
View
B+
Retailer 7
-
$1,074 AUD
$753 USD
View
B+
Retailer 8
-
$1,104 AUD
$774 USD
View
B+
Retailer 9
-
$1,120 AUD
$785 USD
View
B+
Retailer 10
-
$1,136 AUD
£627 GBP
View
B
Retailer 11
-
$1,199 AUD
$840 USD
View
B
Retailer 12
-
$1,248 AUD
€833 EUR
View
B+
Retailer 13
-
$1,282 AUD
$898 USD
View
Retailer 14
-
$1,305 AUD
$915 USD
View
Price last confirmed 7 days ago
B
Retailer 15
-
$1,342 AUD
$941 USD
View
Retailer 16
-
$1,401 AUD
View
Price last confirmed 29 days ago
B
Retailer 17
-
$1,438 AUD
ZAR 16,278 ZAR
View
B
Retailer 18
-
$2,151 AUD
£1,187 GBP
View
Most Expensive
NZ Jewellers
8fc8395c-49aa-4154-9434-046bd2f4a0ba · Nov 3
$2,921 AUD
$2,047 USD
View
Price under review
18 more retailers have this diamond
Prices start from $785 AUDSave up to $1,366 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