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Marquise|Natural|GIA

1.21ct F SI2 Marquise Natural Diamond

EX • F/SI2 • GIA 2245057364

Certificate GIA 2245057364

Diamond specifications and retailer prices

From £2,717 GBP
As of November 4, 2026
Save £2,153 GBP (44%) vs most expensive(unlock to see where)
13 retailers carry this diamond
Most expensive: £4,870 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 top-tier cut grade stated by the retailer rather than the lab and certified by GIA 2245057364. Listed at 13 retailers as of November 4, 2026, with prices from £2,717 to £4,870, a £2,153 spread on the same certified stone. Helzberg Diamonds lists it at £4,870. 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

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

Specifications

Cut (retailer stated)Excellent
PolishExcellent
SymmetryExcellent
FluorescenceNone
Crown angle39.96°
Pavilion angle37.63°
OriginNatural
Grading LabGIA
CertificateGIA 2245057364
Dimensions10.52 × 5.56 × 3.39 mm
L/W Ratio1.89
Culet sizeNone
Top View
10.52 mm5.56 mm1.21 ctF / SI2
OriginNatural
CutExcellent
PolishExcellent
SymmetryExcellent
FluorescenceNone
CertificateGIA 2245057364
Side View
Table 58.0%Crown 39.96°Girdle: STK-THKPavilion 37.63°Culet: NoneDepth 61.0%

Caratlytics Score

How it works →
A
Excellent
Excellent quality and great value
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See the detailed 0 to 100 score with Quality, Value, Certification & Market breakdown

Price History

Last verified: Nov 4
Current: £4,870 GBP|Low: £2,717 GBP|High: £5,227 GBP|Avg: £3,447 GBP|-6.8%
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
November 6, 2026
Retailer 10£2,717 GBP
Retailer 4£2,786 GBP
Retailer 8£2,841 GBP
Retailer 7£2,904 GBP
Retailer 3£2,965 GBP
Retailer 5£2,988 GBP
Retailer 6£3,117 GBP
Retailer 9£3,362 GBP
Retailer 12£3,444 GBP
Retailer 13£3,471 GBP
Retailer 2£3,493 GBP
Retailer 11£4,851 GBP
Helzberg Diamonds£4,870 GBP

39 data points across 13 retailers

13 retailers£2,717 GBP to £4,870 GBP

A
Cheapest Retailer
-
£2,717 GBP
A
Retailer 2
-
£2,786 GBP
View
A
Retailer 3
-
£2,841 GBP
View
B+
Retailer 4
-
£2,904 GBP
View
B+
Retailer 5
-
£2,965 GBP
View
Retailer 6
-
£2,988 GBP
View
Price last confirmed 10 days ago
B+
Retailer 7
-
£3,117 GBP
View
B+
Retailer 8
-
£3,362 GBP
View
B+
Retailer 9
-
£3,444 GBP
View
B+
Retailer 10
-
£3,471 GBP
View
B+
Retailer 11
-
£3,493 GBP
View
B
Retailer 12
-
£4,851 GBP
View
Most Expensive
B
Helzberg Diamonds
XZRIIKLGLNJMK · Nov 6
£4,870 GBP
$6,519 USD
View
12 more retailers have this diamond
Prices start from £2,717 GBPSave up to £2,153 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
£2,717 GBP