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Marquise|Natural|GIA

1.51ct G SI1 Marquise Natural Diamond

ID • G/SI1 • GIA 2554499853

Certificate GIA 2554499853

Diamond specifications and retailer prices

From $12,500 AUD
$8,760 USD
As of November 2, 2026
2 retailers carry this diamond
Most expensive: $12,500 AUD at Brilliant Earth
View at Brilliant Earth

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 2554499853. Listed at 2 retailers as of November 2, 2026. 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
FluorescenceMedium
Crown angle38.37°
Pavilion angle39.52°
OriginNatural
Grading LabGIA
CertificateGIA 2554499853
Dimensions11.38 × 6.06 × 3.79 mm
L/W Ratio1.88
Girdle conditionVery Thick
Key to symbols
Crystal, Needle
Top View
11.38 mm6.06 mm1.51 ctG / SI1
OriginNatural
CutIdeal
PolishExcellent
SymmetryVery Good
FluorescenceMedium
CertificateGIA 2554499853
Side View
Table 57.0%Crown 38.37°Girdle: STK-VTKPavilion 39.52°CuletDepth 62.6%

Caratlytics Score

How it works →
B+
Very Good
Strong quality and value balance
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Price History

Last verified: Nov 2
Current: $12,500 AUD|Low: $11,009 AUD|High: $16,317 AUD|Avg: $13,790 AUD|-12.7%
Brilliant Earth
Retailer 2
Retailer 3
Retailer 4
Retailer 5
October 31, 2026
Retailer 2$11,009 AUD
Retailer 3$12,352 AUD
Brilliant Earth$12,500 AUD
Retailer 4$13,882 AUD
Retailer 5$16,317 AUD

9 data points across 5 retailers

2 retailers

Retailer 1
-
$11,009 AUD
$7,715 USD
Price last confirmed 12 days ago
Most Expensive
B+
Brilliant Earth
20223130A · Nov 2
$12,500 AUD
$8,760 USD
View
1 more retailer has this diamond

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
$12,500 AUD