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Marquise|Natural|IGI

0.51ct I SI2 Marquise Natural Diamond

GD • I/SI2 • IGI 649481398

Shape and cutting style on the report: Marquise brilliant

Certificate IGI 649481398

Diamond specifications and retailer prices

From $587 AUD
As of November 5, 2026
Save $1,662 AUD (74%) vs most expensive(unlock to see where)
13 retailers carry this diamond
Most expensive: $2,249 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 standard cut grade and certified by IGI 649481398. Listed at 13 retailers as of November 5, 2026, with prices from $587 to $2,249, a $1,662 spread on the same certified stone. NZ Jewellers lists it at $2,249. Cut grade matters more than carat or clarity for visible brilliance. If you can shift budget toward an Excellent or Ideal cut, do it before chasing higher colour or clarity.

The 4Cs

0.51
Carat
I
Colour
SI2
Clarity
Good
Cut

Specifications

CutGood
PolishVery Good
SymmetryVery Good
FluorescenceNone
Crown angle38.2°
Pavilion angle36.7°
OriginNatural
Grading LabIGI
CertificateIGI 649481398
Dimensions9.00 × 4.02 × 2.32 mm
L/W Ratio2.24
Girdle conditionFaceted
Culet sizePointed
Top View
9.00 mm4.02 mm0.51 ctI / SI2
OriginNatural
CutGood
PolishVery Good
SymmetryVery Good
FluorescenceNone
CertificateIGI 649481398
Side View
Table 64.0%Crown 38.2°Girdle: STK-VTKPavilion 36.7°Culet: NoneDepth 57.7%

Caratlytics Score

How it works →
B+
Very Good
Strong quality and value balance
Unlock full score analysis
See the detailed 0 to 100 score with Quality, Value, Certification & Market breakdown

Price History

Last verified: Nov 5
Current: $2,249 AUD|Low: $587 AUD|High: $2,249 AUD|Avg: $894 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 6, 2026
Retailer 3$587 AUD
Retailer 9$611 AUD
Retailer 4$632 AUD
Retailer 10$632 AUD
Retailer 12$640 AUD
Retailer 14$677 AUD
Retailer 2$696 AUD
Retailer 5$776 AUD
Retailer 11$814 AUD
Retailer 13$819 AUD
Retailer 6$881 AUD
Retailer 7$1,055 AUD
Retailer 8$1,352 AUD
NZ Jewellers$2,249 AUD

42 data points across 14 retailers

13 retailers$587 AUD to $2,249 AUD

Retailer 1
-
$587 AUD
Price last confirmed 53 days ago
B+
Retailer 2
-
$587 AUD
View
B+
Retailer 3
-
$611 AUD
View
Retailer 4
-
$632 AUD
View
Price last confirmed 8 days ago
B+
Retailer 5
-
$632 AUD
View
B+
Retailer 6
-
$677 AUD
View
B+
Retailer 7
-
$696 AUD
View
B+
Retailer 8
-
$776 AUD
View
B+
Retailer 9
-
$814 AUD
View
B+
Retailer 10
-
$819 AUD
View
B
Retailer 11
-
$1,055 AUD
View
B
Retailer 12
-
$1,352 AUD
View
Most Expensive
C
NZ Jewellers
dc731d7a-b765-4572-94a9-9777cff5c7f0 · Nov 5
$2,249 AUD
$1,545 USD
View
12 more retailers have this diamond
Prices start from $587 AUDSave up to $1,662 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.

B+
0.51ct Marquise
$587 AUD