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Cushion|Natural|GIA

1.21ct I SI1 Cushion Natural Diamond

EX • I/SI1 • GIA 2235970813

Certificate GIA 2235970813

Diamond specifications and retailer prices

From £1,655 GBP
As of November 7, 2026
Save £1,311 GBP (44%) vs most expensive(unlock to see where)
7 retailers carry this diamond
Most expensive: £2,966 GBP at Blue Nile · As of November 5, 2026
View at Blue Nile

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 2235970813. Listed at 7 retailers as of November 5, 2026, with prices from £1,655 to £2,966, a £1,311 spread on the same certified stone. Blue Nile lists it at £2,966. 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
Excellent
Cut (retailer stated)

Specifications

Cut (retailer stated)Excellent
PolishExcellent
SymmetryExcellent
FluorescenceNone
Pavilion angle38.01°
OriginNatural
Grading LabGIA
CertificateGIA 2235970813
Dimensions7.08 × 5.53 × 3.85 mm
L/W Ratio1.28
Key to symbols
Crystal, Feather, Needle
Top View
7.08 mm5.53 mm1.21 ctI / SI1
OriginNatural
CutExcellent
PolishExcellent
SymmetryExcellent
FluorescenceNone
CertificateGIA 2235970813
Side View
Table 65.0%CrownGirdle: STK-VTKPavilion 38.01°Culet: NoneDepth 69.7%

Caratlytics Score

How it works →
B+
Very Good
Strong quality and value balance
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See the detailed 0 to 100 score with Quality, Value, Certification & Market breakdown

Price History

Last verified: Nov 7
Current: £2,966 GBP|Low: £1,128 GBP|High: £2,966 GBP|Avg: £1,834 GBP|+64.0%
Blue Nile
Retailer 2
Retailer 3
Retailer 4
Retailer 5
Retailer 6
Retailer 7
Retailer 8
October 29, 2026
Retailer 6£1,128 GBP
Retailer 4£1,527 GBP
Retailer 7£1,579 GBP
Retailer 8£1,655 GBP
Retailer 2£2,087 GBP
Retailer 3£2,113 GBP
Retailer 5£2,741 GBP
Blue Nile£2,966 GBP

23 data points across 8 retailers

7 retailers£1,655 GBP to £2,966 GBP

Retailer 1
-
£1,128 GBP
Price last confirmed 30 days ago
Retailer 2
-
£1,579 GBP
View
Price last confirmed 32 days ago
B+
Retailer 3
-
£1,655 GBP
View
Retailer 4
-
£2,049 GBP
View
Price last confirmed 14 days ago
Retailer 5
-
£2,087 GBP
View
Price last confirmed 12 days ago
Retailer 6
-
£2,741 GBP
View
Price last confirmed 33 days ago
Most Expensive
B
Blue Nile
30516716 · Nov 5
£2,966 GBP
$3,970 USD
View
6 more retailers have this diamond
Prices start from £1,655 GBPSave up to £1,311 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 Cushion
£1,655 GBP