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Marquise|Natural|GIA

1.21ct H SI2 Marquise Natural Diamond

VG • H/SI2 • GIA 6551370295

Certificate GIA 6551370295

Diamond specifications and retailer prices

From £2,409 GBP
As of November 4, 2026
Save £1,910 GBP (44%) vs most expensive(unlock to see where)
12 retailers carry this diamond
Most expensive: £4,319 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 very-good cut grade stated by the retailer rather than the lab and certified by GIA 6551370295. Listed at 12 retailers as of November 4, 2026, with prices from £2,409 to £4,319, a £1,910 spread on the same certified stone. Helzberg Diamonds lists it at £4,319. 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
H
Colour
SI2
Clarity
Very Good
Cut (retailer stated)

Specifications

Cut (retailer stated)Very Good
PolishExcellent
SymmetryVery Good
FluorescenceFaint
Crown angle40.97°
Pavilion angle39.32°
OriginNatural
Grading LabGIA
CertificateGIA 6551370295
Dimensions10.12 × 5.47 × 3.54 mm
L/W Ratio1.85
Culet sizeNone
Top View
10.12 mm5.47 mm1.21 ctH / SI2
OriginNatural
CutVery Good
PolishExcellent
SymmetryVery Good
FluorescenceFaint
CertificateGIA 6551370295
Side View
Table 60.0%Crown 40.97°Girdle: MED-VTKPavilion 39.32°Culet: NoneDepth 64.8%

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 4
Current: £4,319 GBP|Low: £2,409 GBP|High: £4,497 GBP|Avg: £3,103 GBP|-2.0%
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 10£2,409 GBP
Retailer 9£2,454 GBP
Retailer 12£2,575 GBP
Retailer 8£2,604 GBP
Retailer 4£2,630 GBP
Retailer 6£2,766 GBP
Retailer 11£3,073 GBP
Retailer 3£3,116 GBP
Retailer 5£3,204 GBP
Retailer 2£3,343 GBP
Retailer 7£4,302 GBP
Helzberg Diamonds£4,319 GBP

41 data points across 12 retailers

12 retailers£2,409 GBP to £4,319 GBP

B+
Cheapest Retailer
-
£2,409 GBP
B+
Retailer 2
-
£2,575 GBP
View
B+
Retailer 3
-
£2,604 GBP
View
B+
Retailer 4
-
£2,630 GBP
View
B+
Retailer 5
-
£2,766 GBP
View
B
Retailer 6
-
£3,073 GBP
View
B
Retailer 7
-
£3,116 GBP
View
B
Retailer 8
-
£3,199 GBP
View
B
Retailer 9
-
£3,204 GBP
View
B
Retailer 10
-
£3,343 GBP
View
B
Retailer 11
-
£4,302 GBP
View
Most Expensive
B
Helzberg Diamonds
XZRMLLHJNGIPL · Nov 6
£4,319 GBP
$5,781 USD
View
11 more retailers have this diamond
Prices start from £2,409 GBPSave up to £1,910 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
£2,409 GBP