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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 £410 GBP
HK$4,300 HKD
As of November 1, 2026
Save £723 GBP (64%) vs most expensive(unlock to see where)
11 retailers carry this diamond
Most expensive: £1,133 GBP 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 £410 to £1,133, a £723 spread on the same certified stone. MOH London lists it at £1,133. 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: £1,133 GBP|Low: £401 GBP|High: £1,178 GBP|Avg: £661 GBP|-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£410 GBP
Retailer 6£488 GBP
Retailer 8£496 GBP
Retailer 11£507 GBP
Retailer 9£580 GBP
Retailer 10£586 GBP
Retailer 2£597 GBP
Retailer 4£717 GBP
Retailer 5£753 GBP
Retailer 3£758 GBP
MOH London£1,133 GBP

42 data points across 11 retailers

11 retailers£410 GBP to £1,133 GBP

A
Cheapest Retailer
-
£410 GBP
HK$4,300 HKD
A
Retailer 2
-
£488 GBP
$655 USD
View
Retailer 3
-
£496 GBP
$665 USD
View
Price last confirmed 14 days ago
B+
Retailer 4
-
£507 GBP
SGD 920 SGD
View
B+
Retailer 5
-
£580 GBP
$778 USD
View
B
Retailer 6
-
£586 GBP
$787 USD
View
B+
Retailer 7
-
£597 GBP
View
B
Retailer 8
-
£717 GBP
€916 EUR
View
B
Retailer 9
-
£753 GBP
ZAR 16,334 ZAR
View
Retailer 10
-
£758 GBP
A$1,565 AUD
View
Price last confirmed 29 days ago
Most Expensive
B
MOH London
83146B0B4 · Oct 29
£1,133 GBP
View
10 more retailers have this diamond
Prices start from £410 GBPSave up to £723 GBP

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
£410 GBP