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Marquise|Natural|GIA

1.00ct H SI1 Marquise Natural Diamond

EX • H/SI1 • GIA 6555978887

Certificate GIA 6555978887

Diamond specifications and retailer prices

From £1,693 GBP
As of November 4, 2026
Save £2,065 GBP (55%) vs most expensive(unlock to see where)
19 retailers carry this diamond
Most expensive: £4,697 GBP at NZ Jewellers · As of October 17, 2026
View at NZ Jewellers

About this 1ct natural marquise diamond

This 1ct natural marquise sits in the classic one-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 6555978887. Listed at 19 retailers as of November 2, 2026, with a 122% 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

1.00
Carat
H
Colour
SI1
Clarity
Excellent
Cut (retailer stated)

Specifications

Cut (retailer stated)Excellent
PolishExcellent
SymmetryVery Good
FluorescenceNone
OriginNatural
Grading LabGIA
CertificateGIA 6555978887
Dimensions9.79 × 5.29 × 3.29 mm
L/W Ratio1.85
Girdle conditionFaceted
Culet sizeNone
Key to symbols
Twinning Wisp, Crystal, Feather, Needle, Natural
Top View
9.79 mm5.29 mm1.00 ctH / SI1
OriginNatural
CutExcellent
PolishExcellent
SymmetryVery Good
FluorescenceNone
CertificateGIA 6555978887
Side View
Table 60.0%CrownGirdle: STK-VTKPavilionCulet: NoneDepth 62.2%

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 4
Current: £1,982 GBP|Low: £1,673 GBP|High: £3,859 GBP|Avg: £2,483 GBP|-0.1%
Retailer 1
Retailer 2
Retailer 3
Retailer 4
Retailer 5
Retailer 6
Retailer 7
Retailer 8
Retailer 9
Retailer 10
Retailer 11
Retailer 12
Retailer 13
November 5, 2026
Retailer 10£1,693 GBP
Retailer 7£1,771 GBP
Retailer 1£1,982 GBP
Retailer 2£2,008 GBP
Retailer 3£2,074 GBP
Retailer 4£2,352 GBP
Retailer 5£2,353 GBP
Retailer 6£2,382 GBP
Retailer 13£2,587 GBP
Retailer 11£2,629 GBP
Retailer 9£2,762 GBP
Retailer 8£3,757 GBP
Retailer 12£3,845 GBP

28 data points across 13 retailers

19 retailers£1,693 GBP to £3,757 GBP

A
Cheapest Retailer
-
£1,693 GBP
A
Retailer 2
-
£1,771 GBP
View
B+
Retailer 3
-
£1,982 GBP
View
Retailer 4
-
£2,008 GBP
View
Price last confirmed 7 days ago
B+
Retailer 5
-
£2,103 GBP
View
B+
Retailer 6
-
£2,106 GBP
View
Retailer 7
-
£2,247 GBP
View
Price last confirmed 20 days ago
Retailer 8
-
£2,247 GBP
View
Price last confirmed 18 days ago
Retailer 9
-
£2,333 GBP
View
Price last confirmed 20 days ago
B+
Retailer 10
-
£2,352 GBP
View
Retailer 11
-
£2,353 GBP
View
Price last confirmed 9 days ago
B+
Retailer 12
-
£2,382 GBP
View
Retailer 13
-
£2,410 GBP
View
Price last confirmed 29 days ago
Retailer 14
-
£2,592 GBP
View
Price last confirmed 17 days ago
B
Retailer 15
-
£2,629 GBP
View
B+
Retailer 16
-
£2,762 GBP
View
B
Retailer 17
-
£3,757 GBP
View
Retailer 18
-
£3,845 GBP
View
Price last confirmed 8 days ago
Most Expensive
NZ Jewellers
6cdd9434-35a4-44a2-ba4e-55c626e8c816 · Oct 17
£4,697 GBP
$6,322 USD
View
Price last confirmed 18 days ago
18 more retailers have this diamond
Prices start from £1,693 GBPSave up to £2,065 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
1.00ct Marquise
£1,693 GBP