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Marquise|Natural|GIA

1.51ct K SI2 Marquise Natural Diamond

EX • K/SI2 • GIA 2556649840

Certificate GIA 2556649840

Diamond specifications and retailer prices

From $5,900 AUD
As of November 6, 2026
Save $5,405 AUD (48%) vs most expensive(unlock to see where)
8 retailers carry this diamond
Most expensive: $11,306 AUD at NZ Jewellers · As of November 3, 2026
View at NZ Jewellers

About this 1.51ct natural marquise diamond

This 1.51ct natural marquise sits in the one-and-a-half to two carat band, graded K colour (faint-tinted) and SI2 clarity (slightly-included), with a top-tier cut grade stated by the retailer rather than the lab and certified by GIA 2556649840. Listed at 8 retailers as of November 3, 2026, with prices from $5,900 to $11,306, a $5,405 spread on the same certified stone. NZ Jewellers lists it at $11,306. 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

1.51
Carat
K
Colour
SI2
Clarity
Excellent
Cut (retailer stated)

Specifications

Cut (retailer stated)Excellent
PolishExcellent
SymmetryVery Good
FluorescenceNone
Crown angle39.68°
Pavilion angle39.35°
OriginNatural
Grading LabGIA
CertificateGIA 2556649840
Dimensions13.41 × 5.56 × 3.49 mm
L/W Ratio2.41
Girdle conditionVery Thick
Key to symbols
Twinning Wisp, Crystal, Feather, Cavity, Knot, Needle
Top View
13.41 mm5.56 mm1.51 ctK / SI2
OriginNatural
CutExcellent
PolishExcellent
SymmetryVery Good
FluorescenceNone
CertificateGIA 2556649840
Side View
Table 61.0%Crown 39.68°Girdle: STK-VTKPavilion 39.35°Culet: NoneDepth 62.7%

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: $11,306 AUD|Low: $5,871 AUD|High: $11,563 AUD|Avg: $7,377 AUD|-2.2%
NZ Jewellers
Retailer 2
Retailer 3
Retailer 4
Retailer 5
Retailer 6
Retailer 7
Retailer 8
Retailer 9
November 5, 2026
Retailer 7$5,900 AUD
Retailer 2$5,921 AUD
Retailer 8$6,462 AUD
Retailer 5$6,490 AUD
Retailer 6$6,490 AUD
Retailer 3$6,501 AUD
Retailer 9$6,724 AUD
Retailer 4$10,335 AUD
NZ Jewellers$11,306 AUD

39 data points across 9 retailers

8 retailers$5,900 AUD to $11,306 AUD

A
Cheapest Retailer
-
$5,900 AUD
A
Retailer 2
-
$5,921 AUD
View
A
Retailer 3
-
$6,462 AUD
View
A
Retailer 4
-
$6,490 AUD
View
A
Retailer 5
-
$6,490 AUD
View
A
Retailer 6
-
$6,501 AUD
View
B
Retailer 7
-
$10,335 AUD
View
Most Expensive
B
NZ Jewellers
7a923bb3-f2a1-45e1-bfff-03626e9595cd · Nov 3
$11,306 AUD
$7,768 USD
View
7 more retailers have this diamond
Prices start from $5,900 AUDSave up to $5,405 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
1.51ct Marquise
$5,900 AUD