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Marquise|Natural|GIA

0.51ct K SI1 Marquise Natural Diamond

EX • K/SI1 • GIA 7566603273

Certificate GIA 7566603273

Diamond specifications and retailer prices

From £306 GBP
As of November 6, 2026
Save £321 GBP (51%) vs most expensive(unlock to see where)
11 retailers carry this diamond
Most expensive: £627 GBP at Frank Darling · As of November 6, 2026
View at Frank Darling

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 SI1 clarity (slightly-included), with a top-tier cut grade stated by the retailer rather than the lab and certified by GIA 7566603273. Listed at 11 retailers as of November 6, 2026, with prices from £306 to £627, a £321 spread on the same certified stone. Frank Darling lists it at £627. 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
SI1
Clarity
Excellent
Cut (retailer stated)

Specifications

Cut (retailer stated)Excellent
PolishVery Good
SymmetryVery Good
FluorescenceNone
Crown angle36.24°
Pavilion angle41.54°
OriginNatural
Grading LabGIA
CertificateGIA 7566603273
Dimensions8.13 × 4.12 × 2.65 mm
L/W Ratio1.97
Culet sizeNone
Top View
8.13 mm4.12 mm0.51 ctK / SI1
OriginNatural
CutExcellent
PolishVery Good
SymmetryVery Good
FluorescenceNone
CertificateGIA 7566603273
Side View
Table 58.0%Crown 36.24°Girdle: THN-VTKPavilion 41.54°Culet: NoneDepth 64.4%

Caratlytics Score

How it works →
A
Excellent
Excellent quality and great value
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See the detailed 0 to 100 score with Quality, Value, Certification & Market breakdown

Price History

Last verified: Nov 6
Current: £627 GBP|Low: £306 GBP|High: £627 GBP|Avg: £409 GBP
Frank Darling
Retailer 2
Retailer 3
Retailer 4
Retailer 5
Retailer 6
Retailer 7
Retailer 8
Retailer 9
Retailer 10
Retailer 11
November 6, 2026
Retailer 8£306 GBP
Retailer 10£319 GBP
Retailer 6£333 GBP
Retailer 11£346 GBP
Retailer 5£367 GBP
Retailer 3£397 GBP
Retailer 9£428 GBP
Retailer 2£449 GBP
Retailer 7£458 GBP
Retailer 4£525 GBP
Frank Darling£627 GBP

23 data points across 11 retailers

11 retailers£306 GBP to £627 GBP

A
Cheapest Retailer
-
£306 GBP
A
Retailer 2
-
£319 GBP
View
A
Retailer 3
-
£333 GBP
View
A
Retailer 4
-
£346 GBP
View
A
Retailer 5
-
£367 GBP
View
B+
Retailer 6
-
£397 GBP
View
B+
Retailer 7
-
£428 GBP
View
B+
Retailer 8
-
£449 GBP
View
B+
Retailer 9
-
£458 GBP
View
B+
Retailer 10
-
£525 GBP
View
Most Expensive
B
Frank Darling
2702647HK · Nov 6
£627 GBP
$844 USD
View
10 more retailers have this diamond
Prices start from £306 GBPSave up to £321 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
£306 GBP