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Marquise|Natural|GIA

1.00ct G SI1 Marquise Natural Diamond

VG • G/SI1 • GIA 3555909668

Certificate GIA 3555909668

Diamond specifications and retailer prices

From £2,037 GBP
$2,734 USD
As of October 31, 2026
Save £1,836 GBP (47%) vs most expensive(unlock to see where)
15 retailers carry this diamond
Most expensive: £3,873 GBP at Helzberg Diamonds · As of November 1, 2026
View at Helzberg Diamonds

About this 1ct natural marquise diamond

This 1ct natural marquise sits in the classic one-carat band, graded G colour (near-colourless) and SI1 clarity (slightly-included), with a very-good cut grade stated by the retailer rather than the lab and certified by GIA 3555909668. Listed at 15 retailers as of October 31, 2026, with prices from £2,037 to £3,873, a £1,836 spread on the same certified stone. Helzberg Diamonds lists it at £3,873. Cut grade matters more than carat or clarity for visible brilliance. If you can shift budget toward an Excellent or Ideal cut, do it before chasing higher colour or clarity.

The 4Cs

1.00
Carat
G
Colour
SI1
Clarity
Very Good
Cut (retailer stated)

Specifications

Cut (retailer stated)Very Good
PolishExcellent
SymmetryExcellent
FluorescenceNone
Crown angle40.66°
Pavilion angle38.05°
OriginNatural
Grading LabGIA
CertificateGIA 3555909668
Dimensions9.65 × 5.19 × 3.17 mm
L/W Ratio1.86
Culet sizeNone
Top View
9.65 mm5.19 mm1.00 ctG / SI1
OriginNatural
CutVery Good
PolishExcellent
SymmetryExcellent
FluorescenceNone
CertificateGIA 3555909668
Side View
Table 59.0%Crown 40.66°Girdle: STK-VTKPavilion 38.05°Culet: NoneDepth 61.1%

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: Oct 31
Current: £3,873 GBP|Low: £2,037 GBP|High: £4,023 GBP|Avg: £2,674 GBP|-3.7%
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
Retailer 15
November 2, 2026
Retailer 10£2,037 GBP
Retailer 15£2,075 GBP
Retailer 7£2,167 GBP
Retailer 11£2,196 GBP
Retailer 12£2,203 GBP
Retailer 8£2,382 GBP
Retailer 5£2,454 GBP
Retailer 3£2,621 GBP
Retailer 13£2,623 GBP
Retailer 4£2,686 GBP
Retailer 2£2,721 GBP
Retailer 9£2,826 GBP
Retailer 14£3,435 GBP
Retailer 6£3,658 GBP
Helzberg Diamonds£3,873 GBP

34 data points across 15 retailers

15 retailers£2,037 GBP to £3,873 GBP

A
Cheapest Retailer
-
£2,037 GBP
$2,734 USD
A
Retailer 2
-
£2,075 GBP
SGD 3,763 SGD
View
B+
Retailer 3
-
£2,167 GBP
$2,908 USD
View
B+
Retailer 4
-
£2,196 GBP
$2,947 USD
View
A
Retailer 5
-
£2,203 GBP
$2,956 USD
View
B+
Retailer 6
-
£2,382 GBP
View
B+
Retailer 7
-
£2,454 GBP
SGD 4,450 SGD
View
B+
Retailer 8
-
£2,621 GBP
$3,517 USD
View
B+
Retailer 9
-
£2,623 GBP
$3,520 USD
View
B+
Retailer 10
-
£2,686 GBP
$3,604 USD
View
B+
Retailer 11
-
£2,721 GBP
€3,477 EUR
View
B+
Retailer 12
-
£2,826 GBP
$3,792 USD
View
B
Retailer 13
-
£3,435 GBP
$4,610 USD
View
B
Retailer 14
-
£3,658 GBP
$4,909 USD
View
Most Expensive
B
Helzberg Diamonds
XZRJLLLPGPMMO · Nov 1
£3,873 GBP
$5,198 USD
View
14 more retailers have this diamond
Prices start from £2,037 GBPSave up to £1,836 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
£2,037 GBP