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Marquise|Natural|GIA

0.51ct I SI1 Marquise Natural Diamond

EX • I/SI1 • GIA 2547681359

Certificate GIA 2547681359

Diamond specifications and retailer prices

From £410 GBP
HK$4,300 HKD
As of November 1, 2026
Save £713 GBP (63%) vs most expensive(unlock to see where)
19 retailers carry this diamond
Most expensive: £1,525 GBP at NZ Jewellers · As of October 30, 2026
View at NZ Jewellers

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 2547681359. Listed at 19 retailers as of November 1, 2026, with a 174% 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

0.51
Carat
I
Colour
SI1
Clarity
Excellent
Cut (retailer stated)

Specifications

Cut (retailer stated)Excellent
PolishExcellent
SymmetryVery Good
FluorescenceFaint
OriginNatural
Grading LabGIA
CertificateGIA 2547681359
Dimensions8.18 × 4.16 × 2.67 mm
L/W Ratio1.97
Top View
8.18 mm4.16 mm0.51 ctI / SI1
OriginNatural
CutExcellent
PolishExcellent
SymmetryVery Good
FluorescenceFaint
CertificateGIA 2547681359
Side View
Table 59.0%CrownGirdle: THN-THKPavilionCulet: NoneDepth 64.3%

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: £1,123 GBP|Low: £449 GBP|High: £1,137 GBP|Avg: £697 GBP|-0.2%
Retailer 1
Retailer 2
Retailer 3
Retailer 4
Retailer 5
Retailer 6
Retailer 7
Retailer 8
Retailer 9
November 2, 2026
Retailer 6£449 GBP
Retailer 8£577 GBP
Retailer 3£594 GBP
Retailer 5£626 GBP
Retailer 2£652 GBP
Retailer 9£701 GBP
Retailer 7£731 GBP
Retailer 4£751 GBP
Retailer 1£1,123 GBP

44 data points across 9 retailers

19 retailers£410 GBP to £1,123 GBP

A
Cheapest Retailer
-
£410 GBP
HK$4,300 HKD
A
Retailer 2
-
£449 GBP
$602 USD
View
Final sale: no returns
B+
Retailer 3
-
£487 GBP
$653 USD
View
B+
Retailer 4
-
£487 GBP
$653 USD
View
B+
Retailer 5
-
£505 GBP
$678 USD
View
B+
Retailer 6
-
£510 GBP
SGD 924 SGD
View
B+
Retailer 7
-
£561 GBP
$753 USD
View
B+
Retailer 8
-
£577 GBP
$774 USD
View
B+
Retailer 9
-
£585 GBP
$785 USD
View
B+
Retailer 10
-
£594 GBP
View
B
Retailer 11
-
£626 GBP
$840 USD
View
B
Retailer 12
-
£652 GBP
€833 EUR
View
B+
Retailer 13
-
£669 GBP
$898 USD
View
B
Retailer 14
-
£682 GBP
$915 USD
View
B
Retailer 15
-
£701 GBP
$941 USD
View
Retailer 16
-
£731 GBP
A$1,510 AUD
View
Price last confirmed 28 days ago
B
Retailer 17
-
£751 GBP
ZAR 16,278 ZAR
View
B
Retailer 18
-
£1,123 GBP
View
Most Expensive
NZ Jewellers
8fc8395c-49aa-4154-9434-046bd2f4a0ba · Oct 30
£1,525 GBP
$2,047 USD
View
Price under review
18 more retailers have this diamond
Prices start from £410 GBPSave up to £713 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