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Marquise|Natural|IGI

2.51ct I SI1 Marquise Natural Diamond

VG • I/SI1 • IGI 836680373

Shape and cutting style on the report: Marquise brilliant

Certificate IGI 836680373

Diamond specifications and retailer prices

From $13,869 AUD
$9,720 USD
As of November 2, 2026
Save $7,175 AUD (34%) vs most expensive(unlock to see where)
4 retailers carry this diamond
Most expensive: $21,045 AUD at MOH London · As of November 2, 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 SI1 clarity (slightly-included), with a very-good cut grade and certified by IGI 836680373. Listed at 4 retailers as of November 2, 2026, with prices from $13,869 to $21,045, a $7,175 spread on the same certified stone. MOH London lists it at $21,045. 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

2.51
Carat
I
Colour
SI1
Clarity
Very Good
Cut

Specifications

CutVery Good
PolishExcellent
SymmetryExcellent
FluorescenceFaint
Crown angle45.2°
Pavilion angle41.7°
OriginNatural
Grading LabIGI
CertificateIGI 836680373
Dimensions12.85 × 6.80 × 4.61 mm
L/W Ratio1.89
Girdle conditionFaceted
Top View
12.85 mm6.80 mm2.51 ctI / SI1
OriginNatural
CutVery Good
PolishExcellent
SymmetryExcellent
FluorescenceFaint
CertificateIGI 836680373
Side View
Table 64.0%Crown 45.2°Girdle: STK-THKPavilion 41.7°CuletDepth 67.8%

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: $21,045 AUD|Low: $13,869 AUD|High: $22,406 AUD|Avg: $16,391 AUD|-6.1%
MOH London
Retailer 2
Retailer 3
Retailer 4
November 2, 2026
Retailer 4$13,869 AUD
Retailer 3$14,697 AUD
Retailer 2$15,503 AUD
MOH London$21,045 AUD

17 data points across 4 retailers

4 retailers$13,869 AUD to $21,045 AUD

A
Cheapest Retailer
-
$13,869 AUD
$9,720 USD
A
Retailer 2
-
$14,697 AUD
$10,300 USD
View
A
Retailer 3
-
$15,503 AUD
£8,555 GBP
View
Most Expensive
B+
MOH London
90C788914 · Nov 2
$21,045 AUD
£11,613 GBP
View
3 more retailers have this diamond
Prices start from $13,869 AUDSave up to $7,175 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
$13,869 AUD