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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 $403 USD
As of November 5, 2026
Save $1,142 USD (74%) vs most expensive(unlock to see where)
13 retailers carry this diamond
Most expensive: $1,545 USD 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 $403 to $1,545, a $1,142 spread on the same certified stone. NZ Jewellers lists it at $1,545. 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
Color
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: $1,545 USD|Low: $403 USD|High: $1,545 USD|Avg: $615 USD
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$403 USD
Retailer 9$420 USD
Retailer 4$434 USD
Retailer 10$434 USD
Retailer 12$440 USD
Retailer 14$465 USD
Retailer 2$478 USD
Retailer 5$533 USD
Retailer 11$559 USD
Retailer 13$563 USD
Retailer 6$605 USD
Retailer 7$725 USD
Retailer 8$929 USD
NZ Jewellers$1,545 USD

42 data points across 14 retailers

13 retailers$403 USD to $1,545 USD

Retailer 1
-
$403 USD
Price last confirmed 53 days ago
B+
Retailer 2
-
$403 USD
View
B+
Retailer 3
-
$420 USD
View
Retailer 4
-
$434 USD
View
Price last confirmed 8 days ago
B+
Retailer 5
-
$434 USD
View
B+
Retailer 6
-
$465 USD
View
B+
Retailer 7
-
$478 USD
View
B+
Retailer 8
-
$533 USD
View
B+
Retailer 9
-
$559 USD
View
B+
Retailer 10
-
$563 USD
View
B
Retailer 11
-
$725 USD
View
B
Retailer 12
-
$929 USD
View
Most Expensive
C
NZ Jewellers
dc731d7a-b765-4572-94a9-9777cff5c7f0 · Nov 5
$1,545 USD
View
12 more retailers have this diamond
Prices start from $403 USDSave up to $1,142 USD

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
$403 USD