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Cushion|Natural|GIA

1.21ct I SI1 Cushion Natural Diamond

ID • I/SI1 • GIA 1309792916

Certificate GIA 1309792916

Diamond specifications and retailer prices

From £1,415 GBP
As of November 6, 2026
Save £1,908 GBP (57%) vs most expensive(unlock to see where)
14 retailers carry this diamond
Most expensive: £3,323 GBP at MOH London · As of November 4, 2026
View at MOH London

About this 1.21ct natural cushion diamond

This 1.21ct natural cushion sits in the classic one-carat band, graded I colour (near-colourless) and SI1 clarity (slightly-included), with a top-tier cut grade stated by the retailer rather than the lab and certified by GIA 1309792916. Listed at 14 retailers as of November 4, 2026, with prices from £1,415 to £3,323, a £1,908 spread on the same certified stone. MOH London lists it at £3,323. 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
SI1
Clarity
Ideal
Cut (retailer stated)

Specifications

Cut (retailer stated)Ideal
PolishExcellent
SymmetryVery Good
FluorescenceStrong
OriginNatural
Grading LabGIA
CertificateGIA 1309792916
Dimensions6.26 × 5.49 × 3.94 mm
L/W Ratio1.14
Key to symbols
Feather, Twinning Wisp, Indented Natural, Natural
Top View
6.26 mm5.49 mm1.21 ctI / SI1
OriginNatural
CutIdeal
PolishExcellent
SymmetryVery Good
FluorescenceStrong
CertificateGIA 1309792916
Side View
Table 58.0%CrownGirdle: Very ThickPavilionCulet: NoneDepth 71.8%

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 6
Current: £3,323 GBP|Low: £1,405 GBP|High: £3,367 GBP|Avg: £2,052 GBP|-1.2%
MOH London
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 9£1,415 GBP
Retailer 10£1,718 GBP
Retailer 11£1,754 GBP
Retailer 3£1,783 GBP
Retailer 2£1,845 GBP
Retailer 12£1,901 GBP
Retailer 8£2,012 GBP
Retailer 4£2,055 GBP
Retailer 5£2,069 GBP
Retailer 13£2,130 GBP
Retailer 7£2,321 GBP
Retailer 6£2,362 GBP
MOH London£3,323 GBP

31 data points across 13 retailers

14 retailers£1,415 GBP to £3,323 GBP

A
Cheapest Retailer
-
£1,415 GBP
B+
Retailer 2
-
£1,718 GBP
View
B+
Retailer 3
-
£1,718 GBP
View
B+
Retailer 4
-
£1,754 GBP
View
Final sale: no returns
B+
Retailer 5
-
£1,783 GBP
View
B+
Retailer 6
-
£1,845 GBP
View
Retailer 7
-
£1,901 GBP
View
Price last confirmed 30 days ago
B+
Retailer 8
-
£1,967 GBP
View
B+
Retailer 9
-
£2,012 GBP
View
B+
Retailer 10
-
£2,069 GBP
View
Retailer 11
-
£2,130 GBP
View
Price last confirmed 31 days ago
B
Retailer 12
-
£2,321 GBP
View
B
Retailer 13
-
£2,362 GBP
View
Most Expensive
B
MOH London
BFA899C27 · Nov 4
£3,323 GBP
View
13 more retailers have this diamond
Prices start from £1,415 GBPSave up to £1,908 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 Cushion
£1,415 GBP