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Marquise|Natural|GIA

1.21ct F SI1 Marquise Natural Diamond

EX • F/SI1 • GIA 6555815638

Certificate GIA 6555815638

Diamond specifications and retailer prices

From £4,119 GBP
As of November 5, 2026
Save £3,541 GBP (46%) vs most expensive(unlock to see where)
15 retailers carry this diamond
Most expensive: £8,719 GBP at NZ Jewellers · As of November 3, 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 top-tier cut grade stated by the retailer rather than the lab and certified by GIA 6555815638. Listed at 15 retailers as of November 4, 2026, with a 86% spread between the cheapest and most expensive listing. That is exactly the kind of price-discovery gap Carat Hunter was built to surface. 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
SI1
Clarity
Excellent
Cut (retailer stated)

Specifications

Cut (retailer stated)Excellent
PolishExcellent
SymmetryVery Good
FluorescenceFaint
OriginNatural
Grading LabGIA
CertificateGIA 6555815638
Dimensions10.54 × 5.44 × 3.46 mm
L/W Ratio1.94
Girdle conditionFaceted
Culet sizeNone
Top View
10.54 mm5.44 mm1.21 ctF / SI1
OriginNatural
CutExcellent
PolishExcellent
SymmetryVery Good
FluorescenceFaint
CertificateGIA 6555815638
Side View
Table 54.0%CrownGirdle: THK-ETKPavilionCulet: NoneDepth 63.5%

Caratlytics Score

How it works →
B+
Very Good
Strong quality and value balance
Unlock full score analysis
See the detailed 0 to 100 score with Quality, Value, Certification & Market breakdown

Price History

Last verified: Nov 5
Current: £4,950 GBP|Low: £4,119 GBP|High: £7,772 GBP|Avg: £5,326 GBP|-1.4%
Retailer 1
Retailer 2
Retailer 3
Retailer 4
Retailer 5
Retailer 6
Retailer 7
Retailer 8
Retailer 9
Retailer 10
November 5, 2026
Retailer 8£4,119 GBP
Retailer 9£4,393 GBP
Retailer 10£4,396 GBP
Retailer 2£4,722 GBP
Retailer 1£4,950 GBP
Retailer 7£5,059 GBP
Retailer 4£5,074 GBP
Retailer 5£5,673 GBP
Retailer 6£6,404 GBP
Retailer 3£7,659 GBP

38 data points across 10 retailers

15 retailers£4,119 GBP to £7,659 GBP

B+
Cheapest Retailer
-
£4,119 GBP
B
Retailer 2
-
£4,393 GBP
View
B
Retailer 3
-
£4,396 GBP
View
B
Retailer 4
-
£4,722 GBP
View
Retailer 5
-
£4,722 GBP
View
Price last confirmed 9 days ago
B
Retailer 6
-
£4,722 GBP
View
B
Retailer 7
-
£4,950 GBP
View
Retailer 8
-
£5,059 GBP
View
Price last confirmed 16 days ago
B
Retailer 9
-
£5,074 GBP
View
B
Retailer 10
-
£5,449 GBP
View
B
Retailer 11
-
£5,673 GBP
View
Retailer 12
-
£5,746 GBP
View
Price last confirmed 15 days ago
B
Retailer 13
-
£6,404 GBP
View
B
Retailer 14
-
£7,659 GBP
View
Most Expensive
NZ Jewellers
f1aca82f-d0db-43c3-a5f3-41e16ae1135e · Nov 3
£8,719 GBP
$11,670 USD
View
Price under review
14 more retailers have this diamond
Prices start from £4,119 GBPSave up to £3,541 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
£4,119 GBP