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Marquise|Natural|GIA

0.51ct I SI1 Marquise Natural Diamond

EX • I/SI1 • GIA 5556998671

Certificate GIA 5556998671

Diamond specifications and retailer prices

From $978 NZD
HK$4,300 HKD
As of November 1, 2026
Save $1,724 NZD (64%) vs most expensive(unlock to see where)
11 retailers carry this diamond
Most expensive: $2,702 NZD at MOH London · As of October 29, 2026
View at MOH London

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 5556998671. Listed at 11 retailers as of October 29, 2026, with prices from $978 to $2,702, a $1,724 spread on the same certified stone. MOH London lists it at $2,702. 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
FluorescenceFaint
OriginNatural
Grading LabGIA
CertificateGIA 5556998671
Dimensions7.90 × 4.12 × 2.61 mm
L/W Ratio1.92
Key to symbols
Twinning Wisp, Feather
Top View
7.90 mm4.12 mm0.51 ctI / SI1
OriginNatural
CutExcellent
PolishVery Good
SymmetryVery Good
FluorescenceFaint
CertificateGIA 5556998671
Side View
Table 61.0%CrownGirdle: MD-ETKPavilionCulet: NoneDepth 63.4%

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 1
Current: $2,702 NZD|Low: $955 NZD|High: $2,810 NZD|Avg: $1,576 NZD|-2.8%
MOH London
Retailer 2
Retailer 3
Retailer 4
Retailer 5
Retailer 6
Retailer 7
Retailer 8
Retailer 9
Retailer 10
Retailer 11
November 2, 2026
Retailer 7$978 NZD
Retailer 6$1,164 NZD
Retailer 8$1,182 NZD
Retailer 11$1,210 NZD
Retailer 9$1,383 NZD
Retailer 10$1,399 NZD
Retailer 2$1,423 NZD
Retailer 4$1,709 NZD
Retailer 5$1,797 NZD
Retailer 3$1,808 NZD
MOH London$2,702 NZD

42 data points across 11 retailers

11 retailers$978 NZD to $2,702 NZD

A
Cheapest Retailer
-
$978 NZD
HK$4,300 HKD
A
Retailer 2
-
$1,164 NZD
$655 USD
View
Retailer 3
-
$1,182 NZD
$665 USD
View
Price last confirmed 14 days ago
B+
Retailer 4
-
$1,210 NZD
SGD 920 SGD
View
B+
Retailer 5
-
$1,383 NZD
$778 USD
View
B
Retailer 6
-
$1,399 NZD
$787 USD
View
B+
Retailer 7
-
$1,423 NZD
£630 GBP
View
B
Retailer 8
-
$1,709 NZD
€916 EUR
View
B
Retailer 9
-
$1,797 NZD
ZAR 16,334 ZAR
View
Retailer 10
-
$1,808 NZD
A$1,565 AUD
View
Price last confirmed 29 days ago
Most Expensive
B
MOH London
83146B0B4 · Oct 29
$2,702 NZD
£1,197 GBP
View
10 more retailers have this diamond
Prices start from $978 NZDSave up to $1,724 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
$978 NZD