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Marquise|Natural|GIA

1.21ct I SI1 Marquise Natural Diamond

EX • I/SI1 • GIA 1545905349

Certificate GIA 1545905349

Diamond specifications and retailer prices

From £3,224 GBP
As of November 6, 2026
Save £1,244 GBP (28%) vs most expensive(unlock to see where)
7 retailers carry this diamond
Most expensive: £4,468 GBP at Jared · As of November 4, 2026
View at Jared

About this 1.21ct natural marquise diamond

This 1.21ct natural marquise sits in the classic one-carat band, graded I colour (near-colourless) and SI1 clarity (slightly-included), with a top-tier cut grade stated by the retailer rather than the lab and certified by GIA 1545905349. Listed at 7 retailers as of November 4, 2026, with prices from £3,224 to £4,468, a £1,244 spread on the same certified stone. Jared lists it at £4,468. 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
I
Colour
SI1
Clarity
Excellent
Cut (retailer stated)

Specifications

Cut (retailer stated)Excellent
PolishExcellent
SymmetryExcellent
FluorescenceFaint
OriginNatural
Grading LabGIA
CertificateGIA 1545905349
Dimensions11.29 × 5.62 × 3.33 mm
L/W Ratio2.01
Girdle conditionFaceted
Key to symbols
Crystal, Feather, Needle
Top View
11.29 mm5.62 mm1.21 ctI / SI1
OriginNatural
CutExcellent
PolishExcellent
SymmetryExcellent
FluorescenceFaint
CertificateGIA 1545905349
Side View
Table 61.0%CrownGirdle: MED-THKPavilionCulet: NoneDepth 59.4%

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 6
Current: £4,468 GBP|Low: £2,859 GBP|High: £4,696 GBP|Avg: £4,031 GBP|-2.0%
Jared
Retailer 2
Retailer 3
Retailer 4
Retailer 5
Retailer 6
Retailer 7
Retailer 8
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Retailer 10
Retailer 11
Retailer 12
Retailer 13
Retailer 14
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Retailer 16
Retailer 17
Retailer 18
October 26, 2026
Retailer 8£2,859 GBP
Retailer 10£2,967 GBP
Retailer 14£3,224 GBP
Retailer 15£3,396 GBP
Retailer 11£3,409 GBP
Retailer 6£3,907 GBP
Retailer 18£3,907 GBP
Retailer 12£4,055 GBP
Retailer 5£4,130 GBP
Retailer 2£4,326 GBP
Retailer 13£4,326 GBP
Retailer 16£4,328 GBP
Jared£4,468 GBP
Retailer 7£4,490 GBP
Retailer 9£4,548 GBP
Retailer 4£4,550 GBP
Retailer 17£4,637 GBP
Retailer 3£4,696 GBP

10 data points across 18 retailers

7 retailers£3,224 GBP to £4,468 GBP

B+
Cheapest Retailer
-
£3,224 GBP
B+
Retailer 2
-
£3,396 GBP
View
Final sale: no returns
B+
Retailer 3
-
£3,409 GBP
View
B
Retailer 4
-
£4,055 GBP
View
B
Retailer 5
-
£4,326 GBP
View
B
Retailer 6
-
£4,326 GBP
View
Most Expensive
B
Jared
159442496 · Nov 4
£4,468 GBP
$5,980 USD
View
6 more retailers have this diamond
Prices start from £3,224 GBPSave up to £1,244 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
£3,224 GBP