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Marquise|Natural|GIA

1.51ct G SI1 Marquise Natural Diamond

ID • G/SI1 • GIA 6545876663

Certificate GIA 6545876663

Diamond specifications and retailer prices

From $15,118 AUD
$10,595 USD
As of November 1, 2026
Save $8,820 AUD (37%) vs most expensive(unlock to see where)
11 retailers carry this diamond
Most expensive: $23,938 AUD at Cape Diamonds · As of October 31, 2026
View at Cape Diamonds

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 6545876663. Listed at 11 retailers as of October 31, 2026, with prices from $15,118 to $23,938, a $8,820 spread on the same certified stone. Cape Diamonds lists it at $23,938. 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
Ideal
Cut (retailer stated)

Specifications

Cut (retailer stated)Ideal
PolishExcellent
SymmetryVery Good
FluorescenceNone
Crown angle38.2°
Pavilion angle39.2°
OriginNatural
Grading LabGIA
CertificateGIA 6545876663
Dimensions11.47 × 6.07 × 3.73 mm
L/W Ratio1.89
Top View
11.47 mm6.07 mm1.51 ctG / SI1
OriginNatural
CutIdeal
PolishExcellent
SymmetryVery Good
FluorescenceNone
CertificateGIA 6545876663
Side View
Table 60.0%Crown 38.2°Girdle: THK-VTKPavilion 39.2°Culet: NoneDepth 61.4%

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: $23,938 AUD|Low: $15,118 AUD|High: $23,938 AUD|Avg: $18,602 AUD|+3.1%
Cape Diamonds
Retailer 2
Retailer 3
Retailer 4
Retailer 5
Retailer 6
Retailer 7
Retailer 8
Retailer 9
Retailer 10
Retailer 11
November 2, 2026
Retailer 10$15,118 AUD
Retailer 7$16,067 AUD
Retailer 4$17,624 AUD
Retailer 5$18,016 AUD
Retailer 8$18,026 AUD
Retailer 9$18,949 AUD
Retailer 11$18,949 AUD
Retailer 2$19,196 AUD
Retailer 6$19,437 AUD
Retailer 3$19,577 AUD
Cape Diamonds$23,938 AUD

43 data points across 11 retailers

11 retailers$15,118 AUD to $23,938 AUD

B+
Cheapest Retailer
-
$15,118 AUD
$10,595 USD
B
Retailer 2
-
$16,067 AUD
$11,260 USD
View
B+
Retailer 3
-
$17,624 AUD
£9,725 GBP
View
B
Retailer 4
-
$18,016 AUD
$12,626 USD
View
B
Retailer 5
-
$18,026 AUD
$12,633 USD
View
B
Retailer 6
-
$18,949 AUD
$13,280 USD
View
B
Retailer 7
-
$18,949 AUD
$13,280 USD
View
B
Retailer 8
-
$19,196 AUD
€12,812 EUR
View
B
Retailer 9
-
$19,437 AUD
$13,622 USD
View
B
Retailer 10
-
$19,577 AUD
$13,720 USD
View
Most Expensive
B
Cape Diamonds
cert_6545876663 · Oct 31
$23,938 AUD
ZAR 271,026 ZAR
View
10 more retailers have this diamond
Prices start from $15,118 AUDSave up to $8,820 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
$15,118 AUD