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Marquise|Natural|GIA

1.51ct I SI1 Marquise Natural Diamond

VG • I/SI1 • GIA 6555154141

Certificate GIA 6555154141

Diamond specifications and retailer prices

From $11,712 AUD
$8,208 USD
As of November 1, 2026
Save $9,139 AUD (44%) vs most expensive(unlock to see where)
16 retailers carry this diamond
Most expensive: $20,851 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 very-good cut grade stated by the retailer rather than the lab and certified by GIA 6555154141. Listed at 16 retailers as of October 30, 2026, with prices from $11,712 to $20,851, a $9,139 spread on the same certified stone. NZ Jewellers lists it at $20,851. 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
Very Good
Cut (retailer stated)

Specifications

Cut (retailer stated)Very Good
PolishExcellent
SymmetryExcellent
FluorescenceNone
Crown angle39.42°
Pavilion angle37.74°
OriginNatural
Grading LabGIA
CertificateGIA 6555154141
Dimensions12.68 × 5.80 × 3.40 mm
L/W Ratio2.19
Top View
12.68 mm5.80 mm1.51 ctI / SI1
OriginNatural
CutVery Good
PolishExcellent
SymmetryExcellent
FluorescenceNone
CertificateGIA 6555154141
Side View
Table 60.0%Crown 39.42°Girdle: MED-VTKPavilion 37.74°Culet: NoneDepth 58.6%

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: $14,195 AUD|Low: $13,566 AUD|High: $19,774 AUD|Avg: $15,622 AUD|-1.0%
Retailer 1
Retailer 2
Retailer 3
Retailer 4
Retailer 5
Retailer 6
Retailer 7
November 2, 2026
Retailer 3$13,566 AUD
Retailer 6$13,733 AUD
Retailer 7$13,761 AUD
Retailer 1$14,195 AUD
Retailer 2$15,757 AUD
Retailer 5$18,379 AUD
Retailer 4$19,539 AUD

38 data points across 7 retailers

16 retailers$11,712 AUD to $20,851 AUD

B+
Cheapest Retailer
-
$11,712 AUD
$8,208 USD
B+
Retailer 2
-
$12,421 AUD
$8,705 USD
View
B+
Retailer 3
-
$12,511 AUD
$8,768 USD
View
B+
Retailer 4
-
$12,615 AUD
$8,841 USD
View
B
Retailer 5
-
$13,337 AUD
$9,347 USD
View
B
Retailer 6
-
$13,553 AUD
$9,498 USD
View
B+
Retailer 7
-
$13,566 AUD
£7,486 GBP
View
Retailer 8
-
$13,733 AUD
View
Price last confirmed 11 days ago
B
Retailer 9
-
$13,761 AUD
$9,644 USD
View
B
Retailer 10
-
$14,195 AUD
£7,833 GBP
View
B
Retailer 11
-
$15,637 AUD
$10,959 USD
View
B
Retailer 12
-
$15,757 AUD
€10,517 EUR
View
Retailer 13
-
$16,466 AUD
$11,540 USD
View
Price last confirmed 10 days ago
B
Retailer 14
-
$18,379 AUD
ZAR 208,082 ZAR
View
B
Retailer 15
-
$19,539 AUD
£10,782 GBP
View
Most Expensive
B
NZ Jewellers
10678399-9b5e-4a92-b356-16fd98a4ee16 · Oct 30
$20,851 AUD
$14,613 USD
View
15 more retailers have this diamond
Prices start from $11,712 AUDSave up to $9,139 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
$11,712 AUD