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Marquise|Natural|GIA

1.21ct H SI2 Marquise Natural Diamond

EX • H/SI2 • GIA 6552321568

Certificate GIA 6552321568

Diamond specifications and retailer prices

From £2,378 GBP
As of November 4, 2026
Save £2,144 GBP (47%) vs most expensive(unlock to see where)
12 retailers carry this diamond
Most expensive: £4,522 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 H 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 6552321568. Listed at 12 retailers as of November 4, 2026, with prices from £2,378 to £4,522, a £2,144 spread on the same certified stone. Helzberg Diamonds lists it at £4,522. 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
H
Colour
SI2
Clarity
Excellent
Cut (retailer stated)

Specifications

Cut (retailer stated)Excellent
PolishExcellent
SymmetryExcellent
FluorescenceNone
Crown angle35.45°
Pavilion angle42.02°
OriginNatural
Grading LabGIA
CertificateGIA 6552321568
Dimensions10.69 × 5.65 × 3.55 mm
L/W Ratio1.89
Culet sizeNone
Top View
10.69 mm5.65 mm1.21 ctH / SI2
OriginNatural
CutExcellent
PolishExcellent
SymmetryExcellent
FluorescenceNone
CertificateGIA 6552321568
Side View
Table 61.0%Crown 35.45°Girdle: MED-THKPavilion 42.02°Culet: NoneDepth 62.8%

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: £4,522 GBP|Low: £2,378 GBP|High: £4,527 GBP|Avg: £3,117 GBP|-0.1%
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£2,378 GBP
Retailer 6£2,397 GBP
Retailer 5£2,436 GBP
Retailer 8£2,541 GBP
Retailer 4£2,730 GBP
Retailer 11£2,864 GBP
Retailer 9£3,035 GBP
Retailer 10£3,080 GBP
Retailer 2£3,163 GBP
Retailer 3£4,248 GBP
Helzberg Diamonds£4,522 GBP

43 data points across 11 retailers

12 retailers£2,378 GBP to £4,522 GBP

A
Cheapest Retailer
-
£2,378 GBP
A
Retailer 2
-
£2,397 GBP
View
A
Retailer 3
-
£2,436 GBP
View
B+
Retailer 4
-
£2,541 GBP
View
B+
Retailer 5
-
£2,730 GBP
View
B+
Retailer 6
-
£2,864 GBP
View
B+
Retailer 7
-
£3,035 GBP
View
B+
Retailer 8
-
£3,080 GBP
View
B+
Retailer 9
-
£3,163 GBP
View
B+
Retailer 10
-
£3,222 GBP
View
B
Retailer 11
-
£4,248 GBP
View
Most Expensive
B
Helzberg Diamonds
XZRMLLIJIHLMO · Nov 6
£4,522 GBP
$6,053 USD
View
11 more retailers have this diamond
Prices start from £2,378 GBPSave up to £2,144 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
£2,378 GBP