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Marquise|Natural|GIA

0.51ct I SI1 Marquise Natural Diamond

EX • I/SI1 • GIA 7556820403

Certificate GIA 7556820403

Diamond specifications and retailer prices

From $668 USD
SGD 903 SGD
As of October 31, 2026
Save $428 USD (39%) vs most expensive(unlock to see where)
11 retailers carry this diamond
Most expensive: $1,096 USD 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 I 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 7556820403. Listed at 11 retailers as of October 31, 2026, with prices from $668 to $1,096, a $428 spread on the same certified stone. Frank Darling lists it at $1,096. 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
Color
SI1
Clarity
Excellent
Cut (retailer stated)

Specifications

Cut (retailer stated)Excellent
PolishExcellent
SymmetryVery Good
FluorescenceNone
Crown angle39.1°
Pavilion angle39.97°
OriginNatural
Grading LabGIA
CertificateGIA 7556820403
Dimensions8.47 × 3.98 × 2.54 mm
L/W Ratio2.13
Culet sizeNone
Top View
8.47 mm3.98 mm0.51 ctI / SI1
OriginNatural
CutExcellent
PolishExcellent
SymmetryVery Good
FluorescenceNone
CertificateGIA 7556820403
Side View
Table 59.0%Crown 39.1°Girdle: MED-VTKPavilion 39.97°Culet: NoneDepth 63.7%

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: Oct 31
Current: $1,096 USD|Low: $668 USD|High: $1,096 USD|Avg: $900 USD
Frank Darling
Retailer 2
Retailer 3
Retailer 4
Retailer 5
Retailer 6
November 2, 2026
Retailer 6$668 USD
Retailer 3$787 USD
Retailer 2$941 USD
Retailer 4$989 USD
Retailer 5$1,003 USD
Frank Darling$1,096 USD

46 data points across 6 retailers

11 retailers$668 USD to $1,096 USD

A
Cheapest Retailer
-
$668 USD
SGD 903 SGD
B+
Retailer 2
-
$675 USD
SGD 912 SGD
View
B+
Retailer 3
-
$716 USD
View
B+
Retailer 4
-
$787 USD
£619 GBP
View
B
Retailer 5
-
$837 USD
View
B
Retailer 6
-
$878 USD
View
B
Retailer 7
-
$941 USD
€896 EUR
View
B
Retailer 8
-
$944 USD
View
B
Retailer 9
-
$989 USD
View
B
Retailer 10
-
$1,003 USD
View
Most Expensive
B
Frank Darling
2667831HK · Nov 2
$1,096 USD
View
10 more retailers have this diamond
Prices start from $668 USDSave up to $428 USD

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
$668 USD