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Marquise|Natural|GIA

1.51ct H SI1 Marquise Natural Diamond

EX • H/SI1 • GIA 6555830427

Certificate GIA 6555830427

Diamond specifications and retailer prices

From $13,339 AUD
As of November 4, 2026
Save $12,030 AUD (47%) vs most expensive(unlock to see where)
22 retailers carry this diamond
Most expensive: $25,369 AUD at NZ Jewellers · As of November 5, 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 H 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 6555830427. Listed at 22 retailers as of November 4, 2026, with prices from $13,339 to $25,369, a $12,030 spread on the same certified stone. NZ Jewellers lists it at $25,369. 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
H
Colour
SI1
Clarity
Excellent
Cut (retailer stated)

Specifications

Cut (retailer stated)Excellent
PolishExcellent
SymmetryExcellent
FluorescenceFaint
Crown angle39.8°
Pavilion angle39.44°
OriginNatural
Grading LabGIA
CertificateGIA 6555830427
Dimensions11.45 × 5.91 × 3.74 mm
L/W Ratio1.94
Culet sizeNone
Top View
11.45 mm5.91 mm1.51 ctH / SI1
OriginNatural
CutExcellent
PolishExcellent
SymmetryExcellent
FluorescenceFaint
CertificateGIA 6555830427
Side View
Table 58.0%Crown 39.8°Girdle: STK-THKPavilion 39.44°Culet: NoneDepth 63.3%

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 4
Current: $16,286 AUD|Low: $13,339 AUD|High: $24,058 AUD|Avg: $18,166 AUD|-1.3%
Retailer 1
Retailer 2
Retailer 3
Retailer 4
Retailer 5
Retailer 6
Retailer 7
Retailer 8
Retailer 9
Retailer 10
Retailer 11
November 6, 2026
Retailer 6$13,339 AUD
Retailer 10$15,221 AUD
Retailer 1$16,286 AUD
Retailer 3$16,490 AUD
Retailer 8$16,533 AUD
Retailer 2$16,743 AUD
Retailer 11$16,977 AUD
Retailer 9$18,540 AUD
Retailer 7$19,099 AUD
Retailer 4$22,206 AUD
Retailer 5$23,708 AUD

45 data points across 11 retailers

22 retailers$13,339 AUD to $25,369 AUD

B+
Cheapest Retailer
-
$13,339 AUD
B+
Retailer 2
-
$14,122 AUD
View
B+
Retailer 3
-
$14,289 AUD
View
B
Retailer 4
-
$15,042 AUD
View
Retailer 5
-
$15,221 AUD
View
Price last confirmed 9 days ago
B
Retailer 6
-
$15,221 AUD
View
Final sale: no returns
B
Retailer 7
-
$16,286 AUD
View
B
Retailer 8
-
$16,490 AUD
View
Retailer 9
-
$16,533 AUD
View
Price last confirmed 15 days ago
B
Retailer 10
-
$16,743 AUD
View
B
Retailer 11
-
$16,977 AUD
View
B
Retailer 12
-
$17,800 AUD
View
B
Retailer 13
-
$17,800 AUD
View
B
Retailer 14
-
$18,134 AUD
View
B
Retailer 15
-
$18,396 AUD
View
B
Retailer 16
-
$18,540 AUD
View
B
Retailer 17
-
$19,026 AUD
View
B
Retailer 18
-
$19,099 AUD
View
Retailer 19
-
$20,026 AUD
View
Price last confirmed 15 days ago
B
Retailer 20
-
$22,206 AUD
View
B
Retailer 21
-
$23,708 AUD
View
Most Expensive
B
NZ Jewellers
ae7b53dc-56f9-4716-9037-2b4f7d008ff1 · Nov 5
$25,369 AUD
$17,431 USD
View
21 more retailers have this diamond
Prices start from $13,339 AUDSave up to $12,030 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
$13,339 AUD