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Marquise|Natural|GIA

0.51ct I SI2 Marquise Natural Diamond

EX • I/SI2 • GIA 2554118321

Certificate GIA 2554118321

Diamond specifications and retailer prices

From $508 AUD
As of November 6, 2026
Save $611 AUD (55%) vs most expensive(unlock to see where)
3 retailers carry this diamond
Most expensive: $1,119 AUD at 77 Diamonds · As of November 5, 2026
View at 77 Diamonds

About this 0.51ct natural marquise diamond

This 0.51ct natural marquise sits in the half to three-quarter carat band, graded I colour (near-colourless) and SI2 clarity (slightly-included), with a top-tier cut grade stated by the retailer rather than the lab and certified by GIA 2554118321. Listed at 3 retailers as of November 5, 2026, with prices from $508 to $1,119, a $611 spread on the same certified stone. 77 Diamonds lists it at $1,119. 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

0.51
Carat
I
Colour
SI2
Clarity
Excellent
Cut (retailer stated)

Specifications

Cut (retailer stated)Excellent
PolishVery Good
SymmetryVery Good
FluorescenceStrong
OriginNatural
Grading LabGIA
CertificateGIA 2554118321
Dimensions7.01 × 4.33 × 2.78 mm
L/W Ratio1.62
Top View
7.01 mm4.33 mm0.51 ctI / SI2
OriginNatural
CutExcellent
PolishVery Good
SymmetryVery Good
FluorescenceStrong
CertificateGIA 2554118321
Side View
Table 60.0%CrownGirdle: VTK-XTKPavilionCulet: NoneDepth 64.2%

Caratlytics Score

How it works →
A
Excellent
Excellent quality and great value
Unlock full score analysis
See the detailed 0 to 100 score with Quality, Value, Certification & Market breakdown

Price History

Last verified: Nov 6
Current: $1,119 AUD|Low: $508 AUD|High: $1,133 AUD|Avg: $851 AUD|+1.2%
77 Diamonds
Retailer 2
Retailer 3
November 6, 2026
Retailer 2$508 AUD
Retailer 3$911 AUD
77 Diamonds$1,119 AUD

45 data points across 3 retailers

3 retailers$508 AUD to $1,119 AUD

A
Cheapest Retailer
-
$508 AUD
B+
Retailer 2
-
$911 AUD
View
Most Expensive
B
77 Diamonds
MQCPZ4JMPMMT · Nov 5
$1,119 AUD
£605 GBP
View
2 more retailers have this diamond
Prices start from $508 AUDSave up to $611 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.

A
0.51ct Marquise
$508 AUD