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Marquise|Natural|GIA

1.51ct I SI1 Marquise Natural Diamond

GD • I/SI1 • GIA 6555854230

Certificate GIA 6555854230

Diamond specifications and retailer prices

From $9,767 AUD
$6,845 USD
As of November 1, 2026
Save $11,588 AUD (54%) vs most expensive(unlock to see where)
18 retailers carry this diamond
Most expensive: $21,355 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 I colour (near-colourless) and SI1 clarity (slightly-included), with a standard cut grade stated by the retailer rather than the lab and certified by GIA 6555854230. Listed at 18 retailers as of October 30, 2026, with prices from $9,767 to $21,355, a $11,588 spread on the same certified stone. NZ Jewellers lists it at $21,355. 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

1.51
Carat
I
Colour
SI1
Clarity
Good
Cut (retailer stated)

Specifications

Cut (retailer stated)Good
PolishExcellent
SymmetryExcellent
FluorescenceNone
OriginNatural
Grading LabGIA
CertificateGIA 6555854230
Dimensions10.71 × 5.96 × 3.96 mm
L/W Ratio1.80
Culet sizeNone
Top View
10.71 mm5.96 mm1.51 ctI / SI1
OriginNatural
CutGood
PolishExcellent
SymmetryExcellent
FluorescenceNone
CertificateGIA 6555854230
Side View
Table 55.0%CrownGirdle: THK-VTKPavilionCulet: NoneDepth 66.5%

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 1
Current: $21,355 AUD|Low: $9,453 AUD|High: $21,355 AUD|Avg: $12,892 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
Retailer 14
Retailer 15
Retailer 16
Retailer 17
Retailer 18
Retailer 19
November 2, 2026
Retailer 14$9,767 AUD
Retailer 3$9,997 AUD
Retailer 9$10,121 AUD
Retailer 7$10,652 AUD
Retailer 4$10,676 AUD
Retailer 17$10,677 AUD
Retailer 10$11,375 AUD
Retailer 19$11,566 AUD
Retailer 5$11,745 AUD
Retailer 13$11,806 AUD
Retailer 2$12,115 AUD
Retailer 8$12,129 AUD
Retailer 6$12,608 AUD
Retailer 18$13,346 AUD
Retailer 12$13,947 AUD
Retailer 11$14,059 AUD
Retailer 16$15,685 AUD
Retailer 15$17,794 AUD
NZ Jewellers$21,355 AUD

16 data points across 19 retailers

18 retailers$9,767 AUD to $21,355 AUD

B+
Cheapest Retailer
-
$9,767 AUD
$6,845 USD
B+
Retailer 2
-
$9,997 AUD
$7,006 USD
View
B+
Retailer 3
-
$10,121 AUD
$7,093 USD
View
B+
Retailer 4
-
$10,652 AUD
$7,465 USD
View
B+
Retailer 5
-
$10,676 AUD
$7,482 USD
View
Final sale: no returns
B+
Retailer 6
-
$10,677 AUD
$7,483 USD
View
B
Retailer 7
-
$11,375 AUD
$7,972 USD
View
B
Retailer 8
-
$11,566 AUD
$8,106 USD
View
B
Retailer 9
-
$11,745 AUD
$8,231 USD
View
B+
Retailer 10
-
$11,806 AUD
£6,515 GBP
View
B
Retailer 11
-
$12,115 AUD
£6,685 GBP
View
Retailer 12
-
$12,129 AUD
View
Price last confirmed 34 days ago
B
Retailer 13
-
$12,608 AUD
$8,836 USD
View
B
Retailer 14
-
$13,346 AUD
$9,353 USD
View
B
Retailer 15
-
$13,947 AUD
€9,309 EUR
View
B
Retailer 16
-
$15,685 AUD
ZAR 177,588 ZAR
View
B
Retailer 17
-
$17,794 AUD
£9,819 GBP
View
Most Expensive
C
NZ Jewellers
3e8021c5-b628-48f2-a70b-ff429de73b5f · Oct 30
$21,355 AUD
$14,966 USD
View
17 more retailers have this diamond
Prices start from $9,767 AUDSave up to $11,588 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
$9,767 AUD