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Marquise|Natural|GIA

1.51ct F SI1 Marquise Natural Diamond

ID • F/SI1 • GIA 6555004556

Certificate GIA 6555004556

Diamond specifications and retailer prices

From $12,674 AUD
$8,882 USD
As of November 2, 2026
Save $7,751 AUD (38%) vs most expensive(unlock to see where)
9 retailers carry this diamond
Most expensive: $20,425 AUD at NZ Jewellers · As of October 30, 2026
View at NZ Jewellers

About this 1.51ct natural marquise diamond

This 1.51ct natural marquise sits in the one-and-a-half to two carat band, graded F 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 6555004556. Listed at 9 retailers as of October 30, 2026, with prices from $12,674 to $20,425, a $7,751 spread on the same certified stone. NZ Jewellers lists it at $20,425. 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
F
Colour
SI1
Clarity
Ideal
Cut (retailer stated)

Specifications

Cut (retailer stated)Ideal
PolishExcellent
SymmetryVery Good
FluorescenceFaint
Crown angle37.35°
Pavilion angle41.16°
OriginNatural
Grading LabGIA
CertificateGIA 6555004556
Dimensions11.20 × 5.96 × 3.80 mm
L/W Ratio1.88
Top View
11.20 mm5.96 mm1.51 ctF / SI1
OriginNatural
CutIdeal
PolishExcellent
SymmetryVery Good
FluorescenceFaint
CertificateGIA 6555004556
Side View
Table 61.0%Crown 37.35°Girdle: ThickPavilion 41.16°Culet: NoneDepth 63.8%

Caratlytics Score

How it works →
B+
Very Good
Strong quality and value balance
Unlock full score analysis
See the detailed 0 to 100 score with Quality, Value, Certification & Market breakdown

Price History

Last verified: Nov 2
Current: $20,425 AUD|Low: $12,674 AUD|High: $20,425 AUD|Avg: $15,512 AUD
NZ Jewellers
Retailer 2
Retailer 3
Retailer 4
Retailer 5
Retailer 6
Retailer 7
Retailer 8
Retailer 9
Retailer 10
Retailer 11
Retailer 12
Retailer 13
November 2, 2026
Retailer 9$12,674 AUD
Retailer 10$13,399 AUD
Retailer 7$13,458 AUD
Retailer 2$13,710 AUD
Retailer 13$14,312 AUD
Retailer 12$14,654 AUD
Retailer 11$14,663 AUD
Retailer 8$14,880 AUD
Retailer 3$15,079 AUD
Retailer 5$17,156 AUD
Retailer 4$17,253 AUD
Retailer 6$19,138 AUD
NZ Jewellers$20,425 AUD

21 data points across 13 retailers

9 retailers$12,674 AUD to $20,425 AUD

B+
Cheapest Retailer
-
$12,674 AUD
$8,882 USD
B+
Retailer 2
-
$13,399 AUD
$9,390 USD
View
Retailer 3
-
$13,458 AUD
View
Price last confirmed 10 days ago
B+
Retailer 4
-
$13,710 AUD
£7,566 GBP
View
B+
Retailer 5
-
$14,654 AUD
$10,270 USD
View
B+
Retailer 6
-
$14,663 AUD
$10,276 USD
View
B+
Retailer 7
-
$14,880 AUD
$10,428 USD
View
B
Retailer 8
-
$19,138 AUD
£10,561 GBP
View
Most Expensive
B
NZ Jewellers
45b6177d-5acf-4cbc-812e-31be09da4409 · Oct 30
$20,425 AUD
$14,314 USD
View
8 more retailers have this diamond
Prices start from $12,674 AUDSave up to $7,751 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.

B+
1.51ct Marquise
$12,674 AUD