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Cushion|Natural|GIA

1.23ct I SI1 Cushion Natural Diamond

EX • I/SI1 • GIA 6291665728

Certificate GIA 6291665728

Diamond specifications and retailer prices

From £2,885 GBP
As of November 6, 2026
Save £2,324 GBP (45%) vs most expensive(unlock to see where)
9 retailers carry this diamond
Most expensive: £5,209 GBP at MOH London · As of November 4, 2026
View at MOH London

About this 1.23ct natural cushion diamond

This 1.23ct 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 6291665728. Listed at 9 retailers as of November 4, 2026, with prices from £2,885 to £5,209, a £2,324 spread on the same certified stone. MOH London lists it at £5,209. 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

1.23
Carat
I
Colour
SI1
Clarity
Excellent
Cut (retailer stated)

Specifications

Cut (retailer stated)Excellent
PolishExcellent
SymmetryVery Good
FluorescenceNone
OriginNatural
Grading LabGIA
CertificateGIA 6291665728
Dimensions6.13 × 5.85 × 3.94 mm
L/W Ratio1.05
Top View
6.13 mm5.85 mm1.23 ctI / SI1
OriginNatural
CutExcellent
PolishExcellent
SymmetryVery Good
FluorescenceNone
CertificateGIA 6291665728
Side View
Table 61.0%CrownGirdle: ThickPavilionCulet: NoneDepth 67.3%

Caratlytics Score

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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 6
Current: £5,209 GBP|Low: £2,869 GBP|High: £5,416 GBP|Avg: £3,584 GBP|-2.7%
MOH London
Retailer 2
Retailer 3
Retailer 4
Retailer 5
Retailer 6
Retailer 7
Retailer 8
Retailer 9
November 6, 2026
Retailer 9£2,885 GBP
Retailer 5£2,929 GBP
Retailer 7£2,963 GBP
Retailer 8£3,279 GBP
Retailer 3£3,449 GBP
Retailer 6£3,497 GBP
Retailer 2£3,690 GBP
Retailer 4£4,001 GBP
MOH London£5,209 GBP

44 data points across 9 retailers

9 retailers£2,885 GBP to £5,209 GBP

B
Cheapest Retailer
-
£2,885 GBP
Retailer 2
-
£2,929 GBP
View
Price last confirmed 10 days ago
B
Retailer 3
-
£2,963 GBP
View
Retailer 4
-
£3,279 GBP
View
Price last confirmed 9 days ago
B
Retailer 5
-
£3,449 GBP
View
Retailer 6
-
£3,497 GBP
View
Price last confirmed 29 days ago
B
Retailer 7
-
£3,690 GBP
View
B
Retailer 8
-
£4,001 GBP
View
Most Expensive
B
MOH London
1B5FC5FE1 · Nov 4
£5,209 GBP
View
8 more retailers have this diamond
Prices start from £2,885 GBPSave up to £2,324 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
1.23ct Cushion
£2,885 GBP