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Marquise|Natural|GIA

0.51ct I SI1 Marquise Natural Diamond

EX • I/SI1 • GIA 1555183694

Certificate GIA 1555183694

Diamond specifications and retailer prices

From $540 AUD
₹36,074 INR
As of November 2, 2026
Save $1,907 AUD (78%) vs most expensive(unlock to see where)
18 retailers carry this diamond
Most expensive: $2,447 AUD at NZ Jewellers · As of October 30, 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 1555183694. Listed at 18 retailers as of October 30, 2026, with prices from $540 to $2,447, a $1,907 spread on the same certified stone. NZ Jewellers lists it at $2,447. 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
FluorescenceMedium
OriginNatural
Grading LabGIA
CertificateGIA 1555183694
Dimensions9.37 × 4.07 × 2.42 mm
L/W Ratio2.30
Girdle conditionFaceted
Culet sizeNone
Key to symbols
Crystal
Top View
9.37 mm4.07 mm0.51 ctI / SI1
OriginNatural
CutExcellent
PolishExcellent
SymmetryVery Good
FluorescenceMedium
CertificateGIA 1555183694
Side View
Table 61.0%CrownGirdle: THN-THKPavilionCulet: NoneDepth 59.5%

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: $2,447 AUD|Low: $540 AUD|High: $2,447 AUD|Avg: $1,072 AUD
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
November 2, 2026
Retailer 2$540 AUD
Retailer 4$719 AUD
Retailer 3$781 AUD
Retailer 13$840 AUD
Retailer 14$840 AUD
Retailer 11$900 AUD
Retailer 7$958 AUD
Retailer 9$985 AUD
Retailer 5$1,063 AUD
Retailer 6$1,088 AUD
Retailer 8$1,161 AUD
Retailer 12$1,205 AUD
Retailer 10$1,803 AUD
NZ Jewellers$2,447 AUD

24 data points across 14 retailers

18 retailers$540 AUD to $2,447 AUD

A
Cheapest Retailer
-
$540 AUD
₹36,074 INR
B+
Retailer 2
-
$719 AUD
$504 USD
View
Final sale: no returns
A
Retailer 3
-
$781 AUD
$547 USD
View
Retailer 4
-
$812 AUD
SGD 769 SGD
View
Price last confirmed 11 days ago
A
Retailer 5
-
$840 AUD
$589 USD
View
A
Retailer 6
-
$840 AUD
$589 USD
View
A
Retailer 7
-
$900 AUD
$631 USD
View
B+
Retailer 8
-
$900 AUD
$631 USD
View
B+
Retailer 9
-
$958 AUD
£529 GBP
View
B+
Retailer 10
-
$979 AUD
$686 USD
View
B+
Retailer 11
-
$985 AUD
£544 GBP
View
B+
Retailer 12
-
$1,063 AUD
$745 USD
View
B+
Retailer 13
-
$1,088 AUD
$763 USD
View
B+
Retailer 14
-
$1,161 AUD
€775 EUR
View
Retailer 15
-
$1,188 AUD
View
Price last confirmed 30 days ago
B+
Retailer 16
-
$1,205 AUD
ZAR 13,639 ZAR
View
B
Retailer 17
-
$1,803 AUD
£995 GBP
View
Most Expensive
B
NZ Jewellers
4eef1496-8124-46e6-a1a6-194cfc9e4067 · Oct 30
$2,447 AUD
$1,715 USD
View
17 more retailers have this diamond
Prices start from $540 AUDSave up to $1,907 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
$540 AUD