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Marquise|Natural|GIA

1.21ct I SI2 Marquise Natural Diamond

GD • I/SI2 • GIA 6551273825

Certificate GIA 6551273825

Diamond specifications and retailer prices

From £1,946 GBP
As of November 5, 2026
Save £1,596 GBP (45%) vs most expensive(unlock to see where)
12 retailers carry this diamond
Most expensive: £3,542 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 standard cut grade stated by the retailer rather than the lab and certified by GIA 6551273825. Listed at 12 retailers as of November 5, 2026, with prices from £1,946 to £3,542, a £1,596 spread on the same certified stone. Helzberg Diamonds lists it at £3,542. 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
I
Colour
SI2
Clarity
Good
Cut (retailer stated)

Specifications

Cut (retailer stated)Good
PolishExcellent
SymmetryExcellent
FluorescenceNone
Crown angle43.52°
Pavilion angle37.98°
OriginNatural
Grading LabGIA
CertificateGIA 6551273825
Dimensions9.85 × 5.41 × 3.52 mm
L/W Ratio1.82
Culet sizeNone
Top View
9.85 mm5.41 mm1.21 ctI / SI2
OriginNatural
CutGood
PolishExcellent
SymmetryExcellent
FluorescenceNone
CertificateGIA 6551273825
Side View
Table 60.0%Crown 43.52°Girdle: MED-VTKPavilion 37.98°Culet: NoneDepth 65.1%

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 5
Current: £3,542 GBP|Low: £1,900 GBP|High: £3,839 GBP|Avg: £2,614 GBP|-7.7%
Helzberg Diamonds
Retailer 2
Retailer 3
Retailer 4
Retailer 5
Retailer 6
Retailer 7
Retailer 8
Retailer 9
Retailer 10
Retailer 11
November 6, 2026
Retailer 7£1,946 GBP
Retailer 2£2,025 GBP
Retailer 8£2,060 GBP
Retailer 6£2,188 GBP
Retailer 3£2,243 GBP
Retailer 4£2,270 GBP
Retailer 10£2,408 GBP
Retailer 5£2,476 GBP
Retailer 11£2,484 GBP
Retailer 9£3,341 GBP
Helzberg Diamonds£3,542 GBP

43 data points across 11 retailers

12 retailers£1,946 GBP to £3,542 GBP

A
Cheapest Retailer
-
£1,946 GBP
A
Retailer 2
-
£2,025 GBP
View
B+
Retailer 3
-
£2,060 GBP
View
B+
Retailer 4
-
£2,188 GBP
View
B+
Retailer 5
-
£2,243 GBP
View
B+
Retailer 6
-
£2,270 GBP
View
B+
Retailer 7
-
£2,408 GBP
View
B+
Retailer 8
-
£2,476 GBP
View
B+
Retailer 9
-
£2,484 GBP
View
B
Retailer 10
-
£2,695 GBP
View
B
Retailer 11
-
£3,341 GBP
View
Most Expensive
B
Helzberg Diamonds
XZRMLLHINJOIL · Nov 6
£3,542 GBP
$4,741 USD
View
11 more retailers have this diamond
Prices start from £1,946 GBPSave up to £1,596 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
£1,946 GBP