Marquise|Natural|GIA

0.51ct I SI2 Marquise Natural Diamond

EX • I/SI2 • GIA 1553998649

Certificate GIA 1553998649

Diamond specifications and retailer prices

From $486 USD
As of November 6, 2026
Save $1,334 USD (73%) vs most expensive(unlock to see where)
15 retailers carry this diamond
Most expensive: $1,820 USD at NZ Jewellers · As of November 5, 2026
View at NZ Jewellers

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 1553998649. Listed at 15 retailers as of November 5, 2026, with prices from $486 to $1,820, a $1,334 spread on the same certified stone. NZ Jewellers lists it at $1,820. 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
SI2
Clarity
Excellent
Cut (retailer stated)

Specifications

Cut (retailer stated)Excellent
PolishVery Good
SymmetryVery Good
FluorescenceMedium
OriginNatural
Grading LabGIA
CertificateGIA 1553998649
Dimensions8.72 × 4.07 × 2.52 mm
L/W Ratio2.14
Key to symbols
Twinning Wisp, Feather
Top View
8.72 mm4.07 mm0.51 ctI / SI2
OriginNatural
CutExcellent
PolishVery Good
SymmetryVery Good
FluorescenceMedium
CertificateGIA 1553998649
Side View
Table 55.0%CrownGirdle: STK-THKPavilionCulet: NoneDepth 61.9%

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: $1,820 USD|Low: $473 USD|High: $1,820 USD|Avg: $766 USD|+3.6%
NZ Jewellers
Retailer 2
Retailer 3
Retailer 4
Retailer 5
Retailer 6
Retailer 7
Retailer 8
Retailer 9
Retailer 10
Retailer 11
Retailer 12
Retailer 13
Retailer 14
Retailer 15
November 6, 2026
Retailer 4$486 USD
Retailer 3$535 USD
Retailer 9$580 USD
Retailer 15$590 USD
Retailer 6$604 USD
Retailer 10$625 USD
Retailer 14$625 USD
Retailer 7$670 USD
Retailer 13$670 USD
Retailer 2$689 USD
Retailer 8$705 USD
Retailer 5$714 USD
Retailer 11$856 USD
Retailer 12$1,339 USD
NZ Jewellers$1,820 USD

30 data points across 15 retailers

15 retailers$486 USD to $1,820 USD

A
Cheapest Retailer
-
$486 USD
A
Retailer 2
-
$535 USD
View
Final sale: no returns
A
Retailer 3
-
$580 USD
View
Retailer 4
-
$590 USD
View
Price last confirmed 19 days ago
Retailer 5
-
$604 USD
View
Price last confirmed 10 days ago
B+
Retailer 6
-
$625 USD
View
Retailer 7
-
$625 USD
View
Price last confirmed 8 days ago
B+
Retailer 8
-
$670 USD
View
Retailer 9
-
$670 USD
View
Price last confirmed 19 days ago
B+
Retailer 10
-
$689 USD
View
B+
Retailer 11
-
$705 USD
View
B+
Retailer 12
-
$714 USD
View
B
Retailer 13
-
$856 USD
View
B
Retailer 14
-
$1,339 USD
View
Most Expensive
B
NZ Jewellers
8c553993-763c-4d33-980b-770d3b9d2d4f · Nov 5
$1,820 USD
View
14 more retailers have this diamond
Prices start from $486 USDSave up to $1,334 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
$486 USD