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Marquise|Natural|GIA

1.21ct I SI2 Marquise Natural Diamond

EX • I/SI2 • GIA 6555960270

Certificate GIA 6555960270

Diamond specifications and retailer prices

From £2,226 GBP
As of November 4, 2026
Save £2,007 GBP (47%) vs most expensive(unlock to see where)
12 retailers carry this diamond
Most expensive: £4,232 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 I colour (near-colourless) and SI2 clarity (slightly-included), with a top-tier cut grade stated by the retailer rather than the lab and certified by GIA 6555960270. Listed at 12 retailers as of November 4, 2026, with prices from £2,226 to £4,232, a £2,007 spread on the same certified stone. Helzberg Diamonds lists it at £4,232. 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
SI2
Clarity
Excellent
Cut (retailer stated)

Specifications

Cut (retailer stated)Excellent
PolishExcellent
SymmetryExcellent
FluorescenceNone
Crown angle36.95°
Pavilion angle37.98°
OriginNatural
Grading LabGIA
CertificateGIA 6555960270
Dimensions11.13 × 5.44 × 3.28 mm
L/W Ratio2.05
Culet sizeNone
Top View
11.13 mm5.44 mm1.21 ctI / SI2
OriginNatural
CutExcellent
PolishExcellent
SymmetryExcellent
FluorescenceNone
CertificateGIA 6555960270
Side View
Table 58.0%Crown 36.95°Girdle: ThickPavilion 37.98°Culet: NDepth 60.2%

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: £4,232 GBP|Low: £2,226 GBP|High: £4,498 GBP|Avg: £2,938 GBP|-5.9%
Helzberg Diamonds
Retailer 2
Retailer 3
Retailer 4
Retailer 5
Retailer 6
Retailer 7
Retailer 8
Retailer 9
Retailer 10
Retailer 11
Retailer 12
November 6, 2026
Retailer 8£2,226 GBP
Retailer 2£2,276 GBP
Retailer 7£2,279 GBP
Retailer 9£2,399 GBP
Retailer 6£2,581 GBP
Retailer 3£2,681 GBP
Retailer 10£2,824 GBP
Retailer 11£2,850 GBP
Retailer 12£2,904 GBP
Retailer 5£2,959 GBP
Retailer 4£3,972 GBP
Helzberg Diamonds£4,232 GBP

37 data points across 12 retailers

12 retailers£2,226 GBP to £4,232 GBP

A
Cheapest Retailer
-
£2,226 GBP
A
Retailer 2
-
£2,276 GBP
View
A
Retailer 3
-
£2,279 GBP
View
A
Retailer 4
-
£2,399 GBP
View
B+
Retailer 5
-
£2,581 GBP
View
B+
Retailer 6
-
£2,681 GBP
View
B+
Retailer 7
-
£2,824 GBP
View
B+
Retailer 8
-
£2,850 GBP
View
B+
Retailer 9
-
£2,904 GBP
View
B+
Retailer 10
-
£2,959 GBP
View
B
Retailer 11
-
£3,972 GBP
View
Most Expensive
B
Helzberg Diamonds
XZRMLLLPMGING · Nov 6
£4,232 GBP
$5,665 USD
View
11 more retailers have this diamond
Prices start from £2,226 GBPSave up to £2,007 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
£2,226 GBP