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Marquise|Natural|GIA

1.00ct E SI1 Marquise Natural Diamond

EX • E/SI1 • GIA 6552654453

Certificate GIA 6552654453

Diamond specifications and retailer prices

From £2,346 GBP
As of November 4, 2026
Save £2,115 GBP (47%) vs most expensive(unlock to see where)
15 retailers carry this diamond
Most expensive: £4,461 GBP at Helzberg Diamonds · As of November 6, 2026
View at Helzberg Diamonds

About this 1ct natural marquise diamond

This 1ct natural marquise sits in the classic one-carat band, graded E colour (colourless) and SI1 clarity (slightly-included), with a top-tier cut grade stated by the retailer rather than the lab and certified by GIA 6552654453. Listed at 15 retailers as of November 4, 2026, with prices from £2,346 to £4,461, a £2,115 spread on the same certified stone. Helzberg Diamonds lists it at £4,461. 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
E
Colour
SI1
Clarity
Excellent
Cut (retailer stated)

Specifications

Cut (retailer stated)Excellent
PolishExcellent
SymmetryVery Good
FluorescenceNone
Crown angle35.79°
Pavilion angle41.05°
OriginNatural
Grading LabGIA
CertificateGIA 6552654453
Dimensions10.44 × 5.06 × 3.18 mm
L/W Ratio2.06
Culet sizeNone
Top View
10.44 mm5.06 mm1.00 ctE / SI1
OriginNatural
CutExcellent
PolishExcellent
SymmetryVery Good
FluorescenceNone
CertificateGIA 6552654453
Side View
Table 58.0%Crown 35.79°Girdle: MED-VTKPavilion 41.05°Culet: NoneDepth 62.8%

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: £4,461 GBP|Low: £2,346 GBP|High: £4,461 GBP|Avg: £3,068 GBP|+4.0%
Helzberg Diamonds
Retailer 2
Retailer 3
Retailer 4
Retailer 5
Retailer 6
Retailer 7
Retailer 8
Retailer 9
Retailer 10
Retailer 11
Retailer 12
Retailer 13
Retailer 14
November 6, 2026
Retailer 11£2,346 GBP
Retailer 9£2,403 GBP
Retailer 6£2,410 GBP
Retailer 12£2,529 GBP
Retailer 13£2,534 GBP
Retailer 7£2,720 GBP
Retailer 5£2,825 GBP
Retailer 3£2,995 GBP
Retailer 4£3,041 GBP
Retailer 2£3,118 GBP
Retailer 8£3,255 GBP
Retailer 14£3,956 GBP
Retailer 10£4,209 GBP
Helzberg Diamonds£4,461 GBP

35 data points across 14 retailers

15 retailers£2,346 GBP to £4,461 GBP

A
Cheapest Retailer
-
£2,346 GBP
A
Retailer 2
-
£2,403 GBP
View
A
Retailer 3
-
£2,410 GBP
View
A
Retailer 4
-
£2,529 GBP
View
B+
Retailer 5
-
£2,534 GBP
View
B+
Retailer 6
-
£2,720 GBP
View
B+
Retailer 7
-
£2,825 GBP
View
B+
Retailer 8
-
£2,995 GBP
View
B+
Retailer 9
-
£3,041 GBP
View
B+
Retailer 10
-
£3,118 GBP
View
B
Retailer 11
-
£3,226 GBP
View
B+
Retailer 12
-
£3,255 GBP
View
B
Retailer 13
-
£3,956 GBP
View
B
Retailer 14
-
£4,209 GBP
View
Most Expensive
B
Helzberg Diamonds
XZRMLLIMLKKLJ · Nov 6
£4,461 GBP
$6,004 USD
View
14 more retailers have this diamond
Prices start from £2,346 GBPSave up to £2,115 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
£2,346 GBP