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Marquise|Natural|GIA

2.51ct I SI2 Marquise Natural Diamond

EX • I/SI2 • GIA 6551291620

Certificate GIA 6551291620

Diamond specifications and retailer prices

From $30,466 AUD
CA$29,655 CAD
As of November 2, 2026
Save $19,627 AUD (39%) vs most expensive(unlock to see where)
11 retailers carry this diamond
Most expensive: $50,094 AUD at MOH London · As of November 1, 2026
View at MOH London

About this 2.51ct natural marquise diamond

This 2.51ct natural marquise sits in the two to three carat band, graded I colour (near-colourless) and SI2 clarity (slightly-included), with a top-tier cut grade stated by the retailer rather than the lab and certified by GIA 6551291620. Listed at 11 retailers as of November 1, 2026, with prices from $30,466 to $50,094, a $19,627 spread on the same certified stone. MOH London lists it at $50,094. 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

2.51
Carat
I
Colour
SI2
Clarity
Excellent
Cut (retailer stated)

Specifications

Cut (retailer stated)Excellent
PolishExcellent
SymmetryExcellent
FluorescenceNone
Pavilion angle40.07°
OriginNatural
Grading LabGIA
CertificateGIA 6551291620
Dimensions13.51 × 7.14 × 4.53 mm
L/W Ratio1.89
Key to symbols
Twinning Wisp, Feather, Crystal, Needle
Top View
13.51 mm7.14 mm2.51 ctI / SI2
OriginNatural
CutExcellent
PolishExcellent
SymmetryExcellent
FluorescenceNone
CertificateGIA 6551291620
Side View
Table 62.0%CrownGirdle: STK-VTKPavilion 40.07°Culet: NoneDepth 63.5%

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: $50,094 AUD|Low: $25,077 AUD|High: $50,697 AUD|Avg: $34,437 AUD|-1.2%
MOH London
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
Retailer 15
Retailer 16
Retailer 17
Retailer 18
November 2, 2026
Retailer 9$25,077 AUD
Retailer 4$27,023 AUD
Retailer 8$27,393 AUD
Retailer 2$30,466 AUD
Retailer 3$30,657 AUD
Retailer 10$30,968 AUD
Retailer 13$32,915 AUD
Retailer 11$33,351 AUD
Retailer 18$33,752 AUD
Retailer 5$34,788 AUD
Retailer 7$34,788 AUD
Retailer 14$35,175 AUD
Retailer 6$35,944 AUD
Retailer 15$37,780 AUD
Retailer 12$37,888 AUD
Retailer 16$38,979 AUD
Retailer 17$45,440 AUD
MOH London$50,094 AUD

14 data points across 18 retailers

11 retailers$30,466 AUD to $50,094 AUD

Cheapest Retailer
-
$30,466 AUD
CA$29,655 CAD
A
Retailer 2
-
$30,657 AUD
$21,485 USD
View
A
Retailer 3
-
$32,915 AUD
£18,163 GBP
View
B+
Retailer 4
-
$33,351 AUD
$23,373 USD
View
Retailer 5
-
$33,752 AUD
$23,654 USD
View
Price last confirmed 11 days ago
B+
Retailer 6
-
$35,175 AUD
$24,651 USD
View
B+
Retailer 7
-
$37,780 AUD
$26,477 USD
View
B+
Retailer 8
-
$37,888 AUD
€25,288 EUR
View
Retailer 9
-
$38,979 AUD
$27,317 USD
View
Price last confirmed 12 days ago
Retailer 10
-
$45,440 AUD
$31,845 USD
View
Price last confirmed 12 days ago
Most Expensive
B
MOH London
ED73D92D5 · Nov 1
$50,094 AUD
£27,643 GBP
View
10 more retailers have this diamond
Prices start from $30,466 AUDSave up to $19,627 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
2.51ct Marquise
$30,466 AUD