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Marquise|Natural|GIA

0.51ct I SI1 Marquise Natural Diamond

EX • I/SI1 • GIA 6555746979

Certificate GIA 6555746979

Diamond specifications and retailer prices

From $643 NZD
$362 USD
As of November 2, 2026
Save $2,286 NZD (78%) vs most expensive(unlock to see where)
21 retailers carry this diamond
Most expensive: $2,929 NZD at NZ Jewellers · As of October 17, 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 6555746979. Listed at 21 retailers as of October 30, 2026, with a 355% spread between the cheapest and most expensive listing. That is exactly the kind of price-discovery gap Carat Hunter was built to surface. 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
SI1
Clarity
Excellent
Cut (retailer stated)

Specifications

Cut (retailer stated)Excellent
PolishVery Good
SymmetryVery Good
FluorescenceNone
OriginNatural
Grading LabGIA
CertificateGIA 6555746979
Dimensions7.94 × 4.07 × 2.61 mm
L/W Ratio1.95
Girdle conditionFaceted
Culet sizeNone
Key to symbols
Feather, Crystal, Cloud
Top View
7.94 mm4.07 mm0.51 ctI / SI1
OriginNatural
CutExcellent
PolishVery Good
SymmetryVery Good
FluorescenceNone
CertificateGIA 6555746979
Side View
Table 63.0%CrownGirdle: THK-VTKPavilionCulet: 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 2
Current: $935 NZD|Low: $643 NZD|High: $2,183 NZD|Avg: $1,212 NZD|-2.0%
Retailer 1
Retailer 2
Retailer 3
Retailer 4
Retailer 5
Retailer 6
Retailer 7
Retailer 8
Retailer 9
Retailer 10
Retailer 11
November 2, 2026
Retailer 11$643 NZD
Retailer 4$689 NZD
Retailer 1$935 NZD
Retailer 3$935 NZD
Retailer 9$1,006 NZD
Retailer 5$1,171 NZD
Retailer 10$1,289 NZD
Retailer 7$1,394 NZD
Retailer 2$1,404 NZD
Retailer 8$1,442 NZD
Retailer 6$2,158 NZD

36 data points across 11 retailers

21 retailers$643 NZD to $2,929 NZD

A
Cheapest Retailer
-
$643 NZD
$362 USD
Final sale: no returns
A
Retailer 2
-
$689 NZD
₹36,928 INR
View
Retailer 3
-
$935 NZD
$526 USD
View
Price last confirmed 34 days ago
A
Retailer 4
-
$935 NZD
$526 USD
View
Retailer 5
-
$935 NZD
$526 USD
View
Price last confirmed 15 days ago
A
Retailer 6
-
$935 NZD
$526 USD
View
Retailer 7
-
$1,006 NZD
$566 USD
View
Price last confirmed 16 days ago
A
Retailer 8
-
$1,006 NZD
$566 USD
View
Retailer 9
-
$1,006 NZD
$566 USD
View
Price last confirmed 17 days ago
Retailer 10
-
$1,077 NZD
$606 USD
View
Price last confirmed 34 days ago
Retailer 11
-
$1,077 NZD
$606 USD
View
Price last confirmed 24 days ago
B+
Retailer 12
-
$1,168 NZD
$657 USD
View
B+
Retailer 13
-
$1,171 NZD
£519 GBP
View
B+
Retailer 14
-
$1,289 NZD
$725 USD
View
B+
Retailer 15
-
$1,394 NZD
€747 EUR
View
Retailer 16
-
$1,404 NZD
A$1,216 AUD
View
Price last confirmed 29 days ago
B+
Retailer 17
-
$1,442 NZD
ZAR 13,104 ZAR
View
B
Retailer 18
-
$2,158 NZD
£956 GBP
View
Retailer 19
-
$2,929 NZD
$1,648 USD
View
Price last confirmed 35 days ago
B
Retailer 20
-
$2,929 NZD
$1,648 USD
View
Most Expensive
NZ Jewellers
27bca978-5464-459d-9f2b-309afb09e2c7 · Oct 17
$2,929 NZD
$1,648 USD
View
Price last confirmed 15 days ago
20 more retailers have this diamond
Prices start from $643 NZDSave up to $2,286 NZD

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
$643 NZD