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Marquise|Natural|GIA

1.21ct F SI2 Marquise Natural Diamond

GD • F/SI2 • GIA 1555561523

Certificate GIA 1555561523

Diamond specifications and retailer prices

From £2,395 GBP
As of November 4, 2026
Save £2,159 GBP (47%) vs most expensive(unlock to see where)
12 retailers carry this diamond
Most expensive: £4,554 GBP at Helzberg Diamonds · As of November 6, 2026
View at Helzberg Diamonds

About this 1.21ct natural marquise diamond

This 1.21ct natural marquise sits in the classic one-carat band, graded F colour (colourless) and SI2 clarity (slightly-included), with a standard cut grade stated by the retailer rather than the lab and certified by GIA 1555561523. Listed at 12 retailers as of November 4, 2026, with prices from £2,395 to £4,554, a £2,159 spread on the same certified stone. Helzberg Diamonds lists it at £4,554. 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

1.21
Carat
F
Colour
SI2
Clarity
Good
Cut (retailer stated)

Specifications

Cut (retailer stated)Good
PolishExcellent
SymmetryExcellent
FluorescenceNone
Crown angle43.64°
Pavilion angle40.64°
OriginNatural
Grading LabGIA
CertificateGIA 1555561523
Dimensions9.96 × 5.47 × 3.68 mm
L/W Ratio1.82
Culet sizeNone
Top View
9.96 mm5.47 mm1.21 ctF / SI2
OriginNatural
CutGood
PolishExcellent
SymmetryExcellent
FluorescenceNone
CertificateGIA 1555561523
Side View
Table 59.0%Crown 43.64°Girdle: STK-VTKPavilion 40.64°Culet: NoneDepth 67.3%

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 4
Current: £4,554 GBP|Low: £2,395 GBP|High: £4,652 GBP|Avg: £3,197 GBP|-2.1%
Helzberg Diamonds
Retailer 2
Retailer 3
Retailer 4
Retailer 5
Retailer 6
Retailer 7
Retailer 8
Retailer 9
Retailer 10
Retailer 11
November 7, 2026
Retailer 7£2,395 GBP
Retailer 6£2,504 GBP
Retailer 3£2,612 GBP
Retailer 2£2,766 GBP
Retailer 4£2,882 GBP
Retailer 11£2,885 GBP
Retailer 9£3,056 GBP
Retailer 10£3,100 GBP
Retailer 5£3,186 GBP
Retailer 8£4,294 GBP
Helzberg Diamonds£4,554 GBP

41 data points across 11 retailers

12 retailers£2,395 GBP to £4,554 GBP

A
Cheapest Retailer
-
£2,395 GBP
A
Retailer 2
-
£2,504 GBP
View
B+
Retailer 3
-
£2,612 GBP
View
B+
Retailer 4
-
£2,766 GBP
View
B+
Retailer 5
-
£2,882 GBP
View
B+
Retailer 6
-
£2,885 GBP
View
B+
Retailer 7
-
£3,056 GBP
View
B+
Retailer 8
-
£3,100 GBP
View
B+
Retailer 9
-
£3,186 GBP
View
B
Retailer 10
-
£3,361 GBP
View
B
Retailer 11
-
£4,294 GBP
View
Most Expensive
B
Helzberg Diamonds
XZRHLLLLMHLIJ · Nov 6
£4,554 GBP
$6,096 USD
View
11 more retailers have this diamond
Prices start from £2,395 GBPSave up to £2,159 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
1.21ct Marquise
£2,395 GBP