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Marquise|Natural|GIA

0.51ct K SI2 Marquise Natural Diamond

ID • K/SI2 • GIA 40

Certificate GIA 40

Diamond specifications and retailer prices

From £495 GBP
As of November 6, 2026
Save £95 GBP (16%) vs most expensive(unlock to see where)
2 retailers carry this diamond
Most expensive: £591 GBP at DreamStone · As of November 4, 2026
View at DreamStone

About this 0.51ct natural marquise diamond

This 0.51ct natural marquise sits in the half to three-quarter carat band, graded K colour (faint-tinted) and SI2 clarity (slightly-included), with a top-tier cut grade stated by the retailer rather than the lab and certified by GIA. Listed at 2 retailers as of November 4, 2026, with prices from £495 to £591, a £95 spread on the same certified stone. DreamStone lists it at £591. 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
K
Colour
SI2
Clarity
Ideal
Cut (retailer stated)

Specifications

Cut (retailer stated)Ideal
PolishExcellent
SymmetryVery Good
FluorescenceFaint
OriginNatural
Grading LabGIA
CertificateGIA 40
Dimensions7.54 × 4.39 × 2.65 mm
L/W Ratio1.72
Top View
7.54 mm4.39 mm0.51 ctK / SI2
OriginNatural
CutIdeal
PolishExcellent
SymmetryVery Good
FluorescenceFaint
CertificateGIA 40
Side View
Table 55.0%CrownGirdle: STK-VTKPavilionCulet: NoneDepth 60.4%

Caratlytics Score

How it works →
B+
Very Good
Strong quality and value balance
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Price History

Last verified: Nov 6
Current: £591 GBP|Low: £489 GBP|High: £591 GBP|Avg: £551 GBP
DreamStone
Retailer 2
September 23, 2026
Retailer 2£495 GBP
DreamStone£591 GBP

3 data points across 2 retailers

2 retailers£495 GBP to £591 GBP

B+
Cheapest Retailer
-
£495 GBP
Most Expensive
B
DreamStone
636c1d5976315c1dde59ae1e · Nov 4
£591 GBP
$790 USD
View
1 more retailer has this diamond
Prices start from £495 GBPSave up to £95 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.

B+
0.51ct Marquise
£495 GBP