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Marquise|Natural|GIA

1.51ct D SI1 Marquise Natural Diamond

EX • D/SI1 • GIA 6552452687

Certificate GIA 6552452687

Diamond specifications and retailer prices

From $12,143 AUD
$8,510 USD
As of November 1, 2026
Save $3,211 AUD (21%) vs most expensive(unlock to see where)
6 retailers carry this diamond
Most expensive: $15,353 AUD at Blue Nile · As of October 29, 2026
View at Blue Nile

About this 1.51ct natural marquise diamond

This 1.51ct natural marquise sits in the one-and-a-half to two carat band, graded D colour (colourless) and SI1 clarity (slightly-included), with a top-tier cut grade stated by the retailer rather than the lab and certified by GIA 6552452687. Listed at 6 retailers as of October 29, 2026, with prices from $12,143 to $15,353, a $3,211 spread on the same certified stone. Blue Nile lists it at $15,353. 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
D
Colour
SI1
Clarity
Excellent
Cut (retailer stated)

Specifications

Cut (retailer stated)Excellent
PolishVery Good
SymmetryExcellent
FluorescenceMedium
OriginNatural
Grading LabGIA
CertificateGIA 6552452687
Dimensions11.39 × 5.94 × 3.76 mm
L/W Ratio1.92
Culet sizeNone
Key to symbols
Twinning Wisp, Crystal, Feather, Needle, Indented Natural
Top View
11.39 mm5.94 mm1.51 ctD / SI1
OriginNatural
CutExcellent
PolishVery Good
SymmetryExcellent
FluorescenceMedium
CertificateGIA 6552452687
Side View
Table 60.0%CrownGirdle: STK-VTKPavilionCulet: NoneDepth 63.3%

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 1
Current: $15,353 AUD|Low: $11,755 AUD|High: $16,515 AUD|Avg: $13,666 AUD|-7.0%
Blue Nile
Retailer 2
Retailer 3
Retailer 4
Retailer 5
Retailer 6
Retailer 7
October 31, 2026
Retailer 4$12,143 AUD
Retailer 3$12,265 AUD
Retailer 5$13,132 AUD
Retailer 2$13,169 AUD
Retailer 6$13,695 AUD
Retailer 7$14,822 AUD
Blue Nile$15,353 AUD

37 data points across 7 retailers

6 retailers$12,143 AUD to $15,353 AUD

A
Cheapest Retailer
-
$12,143 AUD
$8,510 USD
A
Retailer 2
-
$12,265 AUD
SGD 11,616 SGD
View
A
Retailer 3
-
$13,132 AUD
$9,203 USD
View
A
Retailer 4
-
$13,169 AUD
£7,267 GBP
View
B+
Retailer 5
-
$13,695 AUD
$9,598 USD
View
Final sale: no returns
Most Expensive
B+
Blue Nile
29415853 · Oct 29
$15,353 AUD
$10,760 USD
View
5 more retailers have this diamond
Prices start from $12,143 AUDSave up to $3,211 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
$12,143 AUD