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Marquise|Natural|GIA

0.51ct H SI1 Marquise Natural Diamond

EX • H/SI1 • GIA 2564717598

Certificate GIA 2564717598

Diamond specifications and retailer prices

From £537 GBP
SGD 973 SGD
As of October 31, 2026
Save £324 GBP (38%) vs most expensive(unlock to see where)
9 retailers carry this diamond
Most expensive: £861 GBP at Frank Darling · As of November 2, 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 H 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 2564717598. Listed at 9 retailers as of October 31, 2026, with prices from £537 to £861, a £324 spread on the same certified stone. Frank Darling lists it at £861. 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
H
Colour
SI1
Clarity
Excellent
Cut (retailer stated)

Specifications

Cut (retailer stated)Excellent
PolishExcellent
SymmetryVery Good
FluorescenceNone
OriginNatural
Grading LabGIA
CertificateGIA 2564717598
Dimensions7.86 × 4.16 × 2.60 mm
L/W Ratio1.89
Culet sizeNone
Top View
7.86 mm4.16 mm0.51 ctH / SI1
OriginNatural
CutExcellent
PolishExcellent
SymmetryVery Good
FluorescenceNone
CertificateGIA 2564717598
Side View
Table 59.0%CrownGirdle: STK-THKPavilionCulet: NoneDepth 62.7%

Caratlytics Score

How it works →
B+
Very Good
Strong quality and value balance
Unlock full score analysis
See the detailed 0 to 100 score with Quality, Value, Certification & Market breakdown

Price History

Last verified: Oct 31
Current: £861 GBP|Low: £537 GBP|High: £861 GBP|Avg: £673 GBP
Frank Darling
Retailer 2
Retailer 3
Retailer 4
Retailer 5
Retailer 6
Retailer 7
Retailer 8
Retailer 9
November 2, 2026
Retailer 9£537 GBP
Retailer 5£549 GBP
Retailer 6£562 GBP
Retailer 7£577 GBP
Retailer 4£714 GBP
Retailer 2£739 GBP
Retailer 8£768 GBP
Retailer 3£805 GBP
Frank Darling£861 GBP

7 data points across 9 retailers

9 retailers£537 GBP to £861 GBP

B+
Cheapest Retailer
-
£537 GBP
SGD 973 SGD
B+
Retailer 2
-
£549 GBP
SGD 996 SGD
View
B+
Retailer 3
-
£562 GBP
$754 USD
View
B+
Retailer 4
-
£577 GBP
$774 USD
View
B
Retailer 5
-
£714 GBP
$958 USD
View
B
Retailer 6
-
£739 GBP
€945 EUR
View
B
Retailer 7
-
£768 GBP
$1,030 USD
View
B
Retailer 8
-
£805 GBP
$1,080 USD
View
Most Expensive
B
Frank Darling
2709605HK · Nov 2
£861 GBP
$1,155 USD
View
8 more retailers have this diamond
Prices start from £537 GBPSave up to £324 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
£537 GBP