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Marquise|Natural|IGI

3.51ct I SI1 Marquise Natural Diamond

VG • I/SI1 • IGI 828653006

Shape and cutting style on the report: Marquise brilliant

Certificate IGI 828653006

Diamond specifications and retailer prices

From $45,104 AUD
₹3,010,439 INR
As of November 2, 2026
Save $30,833 AUD (41%) vs most expensive(unlock to see where)
19 retailers carry this diamond
Most expensive: $75,937 AUD at MOH London · As of November 1, 2026
View at MOH London

About this 3.51ct natural marquise diamond

This 3.51ct natural marquise sits in the three to five carat band, graded I colour (near-colourless) and SI1 clarity (slightly-included), with a very-good cut grade and certified by IGI 828653006. Listed at 19 retailers as of November 1, 2026, with prices from $45,104 to $75,937, a $30,833 spread on the same certified stone. MOH London lists it at $75,937. 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

3.51
Carat
I
Colour
SI1
Clarity
Very Good
Cut

Specifications

CutVery Good
PolishExcellent
SymmetryExcellent
FluorescenceNone
Crown angle33.2°
Pavilion angle40.2°
OriginNatural
Grading LabIGI
CertificateIGI 828653006
Dimensions15.32 × 7.94 × 4.94 mm
L/W Ratio1.93
Girdle conditionFaceted
Culet sizeNone
Top View
15.32 mm7.94 mm3.51 ctI / SI1
OriginNatural
CutVery Good
PolishExcellent
SymmetryExcellent
FluorescenceNone
CertificateIGI 828653006
Side View
Table 59.0%Crown 33.2°Girdle: ThickPavilion 40.2°Culet: NoneDepth 62.2%

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: $75,937 AUD|Low: $45,013 AUD|High: $81,970 AUD|Avg: $56,522 AUD|-4.6%
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
November 2, 2026
Retailer 2$45,104 AUD
Retailer 3$48,864 AUD
Retailer 15$49,197 AUD
Retailer 10$49,740 AUD
Retailer 6$50,649 AUD
Retailer 13$52,075 AUD
Retailer 8$54,012 AUD
Retailer 4$57,624 AUD
Retailer 12$58,143 AUD
Retailer 9$58,978 AUD
Retailer 11$59,756 AUD
Retailer 5$60,025 AUD
Retailer 7$60,379 AUD
Retailer 14$63,033 AUD
MOH London$75,937 AUD

20 data points across 15 retailers

19 retailers$45,104 AUD to $75,937 AUD

A
Cheapest Retailer
-
$45,104 AUD
₹3,010,439 INR
B+
Retailer 2
-
$48,864 AUD
$34,245 USD
View
A
Retailer 3
-
$49,197 AUD
$34,478 USD
View
Final sale: no returns
B+
Retailer 4
-
$49,740 AUD
£27,448 GBP
View
B+
Retailer 5
-
$50,649 AUD
$35,496 USD
View
B+
Retailer 6
-
$52,075 AUD
$36,495 USD
View
B+
Retailer 7
-
$54,012 AUD
£29,805 GBP
View
Retailer 8
-
$54,381 AUD
$38,111 USD
View
Price last confirmed 38 days ago
B+
Retailer 9
-
$57,624 AUD
$40,384 USD
View
Retailer 10
-
$57,671 AUD
$40,417 USD
View
Price last confirmed 12 days ago
B+
Retailer 11
-
$58,143 AUD
$40,748 USD
View
B+
Retailer 12
-
$58,978 AUD
€39,365 EUR
View
B+
Retailer 13
-
$59,756 AUD
$41,878 USD
View
B
Retailer 14
-
$60,025 AUD
$42,067 USD
View
B+
Retailer 15
-
$60,379 AUD
$42,315 USD
View
Retailer 16
-
$62,427 AUD
$43,750 USD
View
Price last confirmed 41 days ago
B+
Retailer 17
-
$63,033 AUD
ZAR 713,642 ZAR
View
Retailer 18
-
$64,828 AUD
$45,433 USD
View
Price last confirmed 39 days ago
Most Expensive
B
MOH London
CBBE91689 · Nov 1
$75,937 AUD
£41,904 GBP
View
18 more retailers have this diamond
Prices start from $45,104 AUDSave up to $30,833 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
3.51ct Marquise
$45,104 AUD