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Marquise|Natural|GIA

1.21ct I SI1 Marquise Natural Diamond

GD • I/SI1 • GIA 1558196256

Certificate GIA 1558196256

Diamond specifications and retailer prices

From £3,844 GBP
As of November 5, 2026
Save £970 GBP (20%) vs most expensive(unlock to see where)
3 retailers carry this diamond
Most expensive: £4,814 GBP at 77 Diamonds · As of November 6, 2026
View at 77 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 SI1 clarity (slightly-included), with a standard cut grade stated by the retailer rather than the lab and certified by GIA 1558196256. Listed at 3 retailers as of November 5, 2026, with prices from £3,844 to £4,814, a £970 spread on the same certified stone. 77 Diamonds lists it at £4,814. 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
SI1
Clarity
Good
Cut (retailer stated)

Specifications

Cut (retailer stated)Good
PolishExcellent
SymmetryExcellent
FluorescenceNone
Crown angle41.51°
Pavilion angle41.34°
OriginNatural
Grading LabGIA
CertificateGIA 1558196256
Dimensions9.88 × 5.41 × 3.63 mm
L/W Ratio1.83
Culet sizeNone
Top View
9.88 mm5.41 mm1.21 ctI / SI1
OriginNatural
CutGood
PolishExcellent
SymmetryExcellent
FluorescenceNone
CertificateGIA 1558196256
Side View
Table 64.0%Crown 41.51°Girdle: STK-VTKPavilion 41.34°Culet: NoneDepth 67.0%

Caratlytics Score

How it works →
B
Good
Decent quality, room for better deals
Unlock full score analysis
See the detailed 0 to 100 score with Quality, Value, Certification & Market breakdown

Price History

Last verified: Nov 5
Current: £4,814 GBP|Low: £2,064 GBP|High: £4,979 GBP|Avg: £3,579 GBP|+1.1%
77 Diamonds
Retailer 2
Retailer 3
Retailer 4
Retailer 5
Retailer 6
Retailer 7
Retailer 8
Retailer 9
Retailer 10
Retailer 11
Retailer 12
Retailer 13
November 6, 2026
Retailer 3£2,064 GBP
Retailer 10£2,813 GBP
Retailer 7£2,935 GBP
Retailer 12£3,024 GBP
Retailer 5£3,307 GBP
Retailer 8£3,500 GBP
Retailer 13£3,504 GBP
Retailer 11£3,532 GBP
Retailer 6£3,844 GBP
Retailer 2£4,469 GBP
Retailer 9£4,579 GBP
77 Diamonds£4,814 GBP
Retailer 4£4,979 GBP

35 data points across 13 retailers

3 retailers£3,844 GBP to £4,814 GBP

B
Cheapest Retailer
-
£3,844 GBP
C
Retailer 2
-
£4,469 GBP
View
Most Expensive
C
77 Diamonds
MQMBY8VBCHFH · Nov 6
£4,814 GBP
View
2 more retailers have this diamond
Prices start from £3,844 GBPSave up to £970 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
£3,844 GBP