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Marquise|Natural|GIA

1.51ct G SI1 Marquise Natural Diamond

EX • G/SI1 • GIA 6555666190

Certificate GIA 6555666190

Diamond specifications and retailer prices

From $11,708 AUD
$8,205 USD
As of November 1, 2026
Save $4,416 AUD (27%) vs most expensive(unlock to see where)
9 retailers carry this diamond
Most expensive: $16,124 AUD at Jared · As of November 2, 2026
View at Jared

About this 1.51ct natural marquise diamond

This 1.51ct natural marquise sits in the one-and-a-half to two carat band, graded G colour (near-colourless) and SI1 clarity (slightly-included), with a top-tier cut grade stated by the retailer rather than the lab and certified by GIA 6555666190. Listed at 9 retailers as of November 1, 2026, with prices from $11,708 to $16,124, a $4,416 spread on the same certified stone. Jared lists it at $16,124. 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
G
Colour
SI1
Clarity
Excellent
Cut (retailer stated)

Specifications

Cut (retailer stated)Excellent
PolishExcellent
SymmetryVery Good
FluorescenceNone
OriginNatural
Grading LabGIA
CertificateGIA 6555666190
Dimensions11.41 × 5.94 × 3.77 mm
L/W Ratio1.92
Culet sizeNone
Key to symbols
Cloud, Crystal, Feather, Cavity, Needle
Top View
11.41 mm5.94 mm1.51 ctG / SI1
OriginNatural
CutExcellent
PolishExcellent
SymmetryVery Good
FluorescenceNone
CertificateGIA 6555666190
Side View
Table 60.0%CrownGirdle: STK-THKPavilionCulet: NoneDepth 63.4%

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: $16,124 AUD|Low: $12,186 AUD|High: $16,880 AUD|Avg: $14,699 AUD|-4.5%
Jared
Retailer 2
Retailer 3
Retailer 4
Retailer 5
Retailer 6
Retailer 7
Retailer 8
November 2, 2026
Retailer 4$12,945 AUD
Retailer 5$13,129 AUD
Retailer 2$13,829 AUD
Retailer 6$13,909 AUD
Retailer 8$14,750 AUD
Retailer 3$15,596 AUD
Retailer 7$15,596 AUD
Jared$16,124 AUD

16 data points across 8 retailers

9 retailers$11,708 AUD to $16,124 AUD

A
Cheapest Retailer
-
$11,708 AUD
$8,205 USD
B+
Retailer 2
-
$12,945 AUD
SGD 12,260 SGD
View
B+
Retailer 3
-
$13,129 AUD
$9,201 USD
View
Final sale: no returns
B+
Retailer 4
-
$13,829 AUD
£7,631 GBP
View
B+
Retailer 5
-
$13,909 AUD
$9,748 USD
View
B+
Retailer 6
-
$14,750 AUD
$10,337 USD
View
B
Retailer 7
-
$15,596 AUD
$10,930 USD
View
B
Retailer 8
-
$15,596 AUD
$10,930 USD
View
Most Expensive
B
Jared
159480438 · Nov 2
$16,124 AUD
$11,300 USD
View
8 more retailers have this diamond
Prices start from $11,708 AUDSave up to $4,416 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
$11,708 AUD