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Marquise|Natural|GIA

0.50ct I SI1 Marquise Natural Diamond

EX • I/SI1 • GIA 6555094150

Certificate GIA 6555094150

Diamond specifications and retailer prices

From £371 GBP
As of November 6, 2026
Save £907 GBP (71%) vs most expensive(unlock to see where)
15 retailers carry this diamond
Most expensive: £1,516 GBP at MOH London · As of November 2, 2026
View at MOH London

About this 0.5ct natural marquise diamond

This 0.5ct 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 6555094150. Listed at 15 retailers as of November 5, 2026, with a 245% 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

0.50
Carat
I
Colour
SI1
Clarity
Excellent
Cut (retailer stated)

Specifications

Cut (retailer stated)Excellent
PolishExcellent
SymmetryVery Good
FluorescenceNone
OriginNatural
Grading LabGIA
CertificateGIA 6555094150
Dimensions7.74 × 4.17 × 2.63 mm
L/W Ratio1.86
Top View
7.74 mm4.17 mm0.50 ctI / SI1
OriginNatural
CutExcellent
PolishExcellent
SymmetryVery Good
FluorescenceNone
CertificateGIA 6555094150
Side View
Table 64.0%CrownGirdle: MED-VTKPavilionCulet: NoneDepth 63.1%

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: £1,516 GBP|Low: £351 GBP|High: £1,516 GBP|Avg: £670 GBP
MOH London
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 6, 2026
Retailer 2£371 GBP
Retailer 6£581 GBP
Retailer 7£671 GBP
Retailer 8£738 GBP
Retailer 4£739 GBP
Retailer 10£764 GBP
Retailer 13£828 GBP
Retailer 3£897 GBP
Retailer 14£930 GBP
Retailer 5£956 GBP
Retailer 11£1,016 GBP
Retailer 12£1,060 GBP
Retailer 9£1,278 GBP
MOH London£1,516 GBP

42 data points across 14 retailers

15 retailers£371 GBP to £1,278 GBP

A
Cheapest Retailer
-
£371 GBP
A
Retailer 2
-
£448 GBP
View
B+
Retailer 3
-
£581 GBP
View
B+
Retailer 4
-
£671 GBP
View
B
Retailer 5
-
£738 GBP
View
B
Retailer 6
-
£739 GBP
View
B
Retailer 7
-
£764 GBP
View
Final sale: no returns
B
Retailer 8
-
£828 GBP
View
B
Retailer 9
-
£897 GBP
View
B
Retailer 10
-
£930 GBP
View
B
Retailer 11
-
£956 GBP
View
B
Retailer 12
-
£1,016 GBP
View
B
Retailer 13
-
£1,060 GBP
View
C
Retailer 14
-
£1,278 GBP
View
Most Expensive
MOH London
14E2BB29A · Nov 2
£1,516 GBP
View
Price under review
14 more retailers have this diamond
Prices start from £371 GBPSave up to £907 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
0.50ct Marquise
£371 GBP