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Marquise|Natural|GIA

1.21ct F SI1 Marquise Natural Diamond

VG • F/SI1 • GIA 2556036557

Certificate GIA 2556036557

Diamond specifications and retailer prices

From £4,170 GBP
As of November 5, 2026
Save £716 GBP (15%) vs most expensive(unlock to see where)
8 retailers carry this diamond
Most expensive: £7,727 GBP at NZ Jewellers · As of September 30, 2026
View at NZ Jewellers

About this 1.21ct natural marquise diamond

This 1.21ct natural marquise sits in the classic one-carat band, graded F colour (colourless) and SI1 clarity (slightly-included), with a very-good cut grade stated by the retailer rather than the lab and certified by GIA 2556036557. Listed at 8 retailers as of November 5, 2026, with a relatively tight 17% spread, which is unusual at this carat range and suggests competitive pricing across the listings. 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
SI1
Clarity
Very Good
Cut (retailer stated)

Specifications

Cut (retailer stated)Very Good
PolishExcellent
SymmetryExcellent
FluorescenceMedium
OriginNatural
Grading LabGIA
CertificateGIA 2556036557
Dimensions10.21 × 5.50 × 3.60 mm
L/W Ratio1.86
Culet sizeNone
Top View
10.21 mm5.50 mm1.21 ctF / SI1
OriginNatural
CutVery Good
PolishExcellent
SymmetryExcellent
FluorescenceMedium
CertificateGIA 2556036557
Side View
Table 57.0%CrownGirdle: STK-VTKPavilionCulet: NoneDepth 65.4%

Caratlytics Score

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B
Good
Decent quality, room for better deals
Unlock full score analysis
See the detailed 0 to 100 score with Quality, Value, Certification & Market breakdown

Price History

Last verified: Nov 5
Current: £7,727 GBP|Low: £3,650 GBP|High: £7,727 GBP|Avg: £4,928 GBP
NZ Jewellers
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
Retailer 16
Retailer 17
Retailer 18
Retailer 19
October 19, 2026
Retailer 11£3,650 GBP
Retailer 4£3,678 GBP
Retailer 10£3,896 GBP
Retailer 8£3,915 GBP
Retailer 2£4,170 GBP
Retailer 5£4,185 GBP
Retailer 19£4,185 GBP
Retailer 12£4,398 GBP
Retailer 16£4,451 GBP
Retailer 15£4,556 GBP
Retailer 14£4,561 GBP
Retailer 6£4,829 GBP
Retailer 13£4,887 GBP
Retailer 18£4,944 GBP
Retailer 7£5,095 GBP
Retailer 3£5,558 GBP
Retailer 17£6,888 GBP
Retailer 9£6,965 GBP
NZ Jewellers£7,727 GBP

10 data points across 19 retailers

8 retailers£4,170 GBP to £4,887 GBP

B
Cheapest Retailer
-
£4,170 GBP
Retailer 2
-
£4,185 GBP
View
Price last confirmed 40 days ago
B
Retailer 3
-
£4,398 GBP
View
Retailer 4
-
£4,556 GBP
View
Price last confirmed 38 days ago
Retailer 5
-
£4,829 GBP
View
Price last confirmed 39 days ago
B
Retailer 6
-
£4,887 GBP
View
Retailer 7
-
£5,558 GBP
View
Price last confirmed 43 days ago
Most Expensive
NZ Jewellers
34bfa772-b0ea-497b-bc59-1fffa3d0ad68 · Sep 30
£7,727 GBP
$10,343 USD
View
Price last confirmed 37 days ago
7 more retailers have this diamond
Prices start from £4,170 GBPSave up to £716 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.

B
1.21ct Marquise
£4,170 GBP