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Marquise|Natural|GIA

0.51ct H SI1 Marquise Natural Diamond

EX • H/SI1 • GIA 2564717598

Certificate GIA 2564717598

Diamond specifications and retailer prices

From $1,027 AUD
SGD 973 SGD
As of October 31, 2026
Save $620 AUD (38%) vs most expensive(unlock to see where)
9 retailers carry this diamond
Most expensive: $1,648 AUD at Frank Darling · As of November 2, 2026
View at Frank Darling

About this 0.51ct natural marquise diamond

This 0.51ct natural marquise sits in the half to three-quarter carat band, graded H 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 2564717598. Listed at 9 retailers as of October 31, 2026, with prices from $1,027 to $1,648, a $620 spread on the same certified stone. Frank Darling lists it at $1,648. 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
H
Colour
SI1
Clarity
Excellent
Cut (retailer stated)

Specifications

Cut (retailer stated)Excellent
PolishExcellent
SymmetryVery Good
FluorescenceNone
OriginNatural
Grading LabGIA
CertificateGIA 2564717598
Dimensions7.86 × 4.16 × 2.60 mm
L/W Ratio1.89
Culet sizeNone
Top View
7.86 mm4.16 mm0.51 ctH / SI1
OriginNatural
CutExcellent
PolishExcellent
SymmetryVery Good
FluorescenceNone
CertificateGIA 2564717598
Side View
Table 59.0%CrownGirdle: STK-THKPavilionCulet: NoneDepth 62.7%

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: Oct 31
Current: $1,648 AUD|Low: $1,027 AUD|High: $1,648 AUD|Avg: $1,289 AUD
Frank Darling
Retailer 2
Retailer 3
Retailer 4
Retailer 5
Retailer 6
Retailer 7
Retailer 8
Retailer 9
November 2, 2026
Retailer 9$1,027 AUD
Retailer 5$1,052 AUD
Retailer 6$1,076 AUD
Retailer 7$1,104 AUD
Retailer 4$1,366 AUD
Retailer 2$1,416 AUD
Retailer 8$1,470 AUD
Retailer 3$1,541 AUD
Frank Darling$1,648 AUD

7 data points across 9 retailers

9 retailers$1,027 AUD to $1,648 AUD

B+
Cheapest Retailer
-
$1,027 AUD
SGD 973 SGD
B+
Retailer 2
-
$1,052 AUD
SGD 996 SGD
View
B+
Retailer 3
-
$1,076 AUD
$754 USD
View
B+
Retailer 4
-
$1,104 AUD
$774 USD
View
B
Retailer 5
-
$1,366 AUD
$958 USD
View
B
Retailer 6
-
$1,416 AUD
€945 EUR
View
B
Retailer 7
-
$1,470 AUD
$1,030 USD
View
B
Retailer 8
-
$1,541 AUD
$1,080 USD
View
Most Expensive
B
Frank Darling
2709605HK · Nov 2
$1,648 AUD
$1,155 USD
View
8 more retailers have this diamond
Prices start from $1,027 AUDSave up to $620 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+
0.51ct Marquise
$1,027 AUD