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Marquise|Natural|GIA

0.51ct I SI1 Marquise Natural Diamond

EX • I/SI1 • GIA 1555183694

Certificate GIA 1555183694

Diamond specifications and retailer prices

From $379 USD
₹36,074 INR
As of November 2, 2026
Save $1,336 USD (78%) vs most expensive(unlock to see where)
18 retailers carry this diamond
Most expensive: $1,715 USD at NZ Jewellers · As of October 30, 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 SI1 clarity (slightly-included), with a top-tier cut grade stated by the retailer rather than the lab and certified by GIA 1555183694. Listed at 18 retailers as of October 30, 2026, with prices from $379 to $1,715, a $1,336 spread on the same certified stone. NZ Jewellers lists it at $1,715. 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
FluorescenceMedium
OriginNatural
Grading LabGIA
CertificateGIA 1555183694
Dimensions9.37 × 4.07 × 2.42 mm
L/W Ratio2.30
Girdle conditionFaceted
Culet sizeNone
Key to symbols
Crystal
Top View
9.37 mm4.07 mm0.51 ctI / SI1
OriginNatural
CutExcellent
PolishExcellent
SymmetryVery Good
FluorescenceMedium
CertificateGIA 1555183694
Side View
Table 61.0%CrownGirdle: THN-THKPavilionCulet: NoneDepth 59.5%

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 2
Current: $1,715 USD|Low: $379 USD|High: $1,715 USD|Avg: $752 USD
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
November 2, 2026
Retailer 2$379 USD
Retailer 4$504 USD
Retailer 3$547 USD
Retailer 13$589 USD
Retailer 14$589 USD
Retailer 11$631 USD
Retailer 7$671 USD
Retailer 9$691 USD
Retailer 5$745 USD
Retailer 6$763 USD
Retailer 8$814 USD
Retailer 12$844 USD
Retailer 10$1,264 USD
NZ Jewellers$1,715 USD

24 data points across 14 retailers

18 retailers$379 USD to $1,715 USD

A
Cheapest Retailer
-
$379 USD
₹36,074 INR
B+
Retailer 2
-
$504 USD
View
Final sale: no returns
A
Retailer 3
-
$547 USD
View
Retailer 4
-
$569 USD
SGD 769 SGD
View
Price last confirmed 11 days ago
A
Retailer 5
-
$589 USD
View
A
Retailer 6
-
$589 USD
View
A
Retailer 7
-
$631 USD
View
B+
Retailer 8
-
$631 USD
View
B+
Retailer 9
-
$671 USD
£529 GBP
View
B+
Retailer 10
-
$686 USD
View
B+
Retailer 11
-
$691 USD
£544 GBP
View
B+
Retailer 12
-
$745 USD
View
B+
Retailer 13
-
$763 USD
View
B+
Retailer 14
-
$814 USD
€775 EUR
View
Retailer 15
-
$832 USD
A$1,280 AUD
View
Price last confirmed 29 days ago
B+
Retailer 16
-
$844 USD
ZAR 13,639 ZAR
View
B
Retailer 17
-
$1,264 USD
£995 GBP
View
Most Expensive
B
NZ Jewellers
4eef1496-8124-46e6-a1a6-194cfc9e4067 · Oct 30
$1,715 USD
View
17 more retailers have this diamond
Prices start from $379 USDSave up to $1,336 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
$379 USD