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Cushion|Natural|GIA

1.23ct G SI1 Cushion Natural Diamond

EX • G/SI1 • GIA 6545684900

Certificate GIA 6545684900

Diamond specifications and retailer prices

From £1,482 GBP
As of November 6, 2026
Save £1,765 GBP (54%) vs most expensive(unlock to see where)
13 retailers carry this diamond
Most expensive: £4,127 GBP at Queensmith · As of October 28, 2026
View at Queensmith

About this 1.23ct natural cushion diamond

This 1.23ct natural cushion sits in the classic one-carat band, graded G 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 6545684900. Listed at 13 retailers as of November 4, 2026, with a 119% spread between the cheapest and most expensive listing. That is exactly the kind of price-discovery gap Carat Hunter was built to surface. 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
G
Colour
SI1
Clarity
Excellent
Cut (retailer stated)

Specifications

Cut (retailer stated)Excellent
PolishExcellent
SymmetryVery Good
FluorescenceNone
OriginNatural
Grading LabGIA
CertificateGIA 6545684900
Dimensions6.22 × 5.77 × 3.73 mm
L/W Ratio1.08
Top View
6.22 mm5.77 mm1.23 ctG / SI1
OriginNatural
CutExcellent
PolishExcellent
SymmetryVery Good
FluorescenceNone
CertificateGIA 6545684900
Side View
Table 69.0%CrownGirdle: MED-THKPavilionCulet: NoneDepth 64.6%

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: £4,127 GBP|Low: £1,482 GBP|High: £4,137 GBP|Avg: £2,226 GBP|+3.1%
Queensmith
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 2£1,482 GBP
Retailer 13£1,715 GBP
Retailer 5£1,757 GBP
Retailer 8£1,757 GBP
Retailer 4£1,801 GBP
Retailer 3£1,871 GBP
Retailer 12£1,963 GBP
Retailer 9£1,966 GBP
Retailer 11£2,017 GBP
Retailer 7£2,267 GBP
Retailer 6£2,308 GBP
Retailer 10£3,246 GBP
Queensmith£4,127 GBP

24 data points across 13 retailers

13 retailers£1,482 GBP to £3,246 GBP

A
Cheapest Retailer
-
£1,482 GBP
A
Retailer 2
-
£1,715 GBP
View
Final sale: no returns
A
Retailer 3
-
£1,757 GBP
View
A
Retailer 4
-
£1,757 GBP
View
A
Retailer 5
-
£1,801 GBP
View
Retailer 6
-
£1,871 GBP
View
Price last confirmed 9 days ago
B+
Retailer 7
-
£1,963 GBP
View
A
Retailer 8
-
£1,966 GBP
View
B+
Retailer 9
-
£2,017 GBP
View
B+
Retailer 10
-
£2,267 GBP
View
B+
Retailer 11
-
£2,308 GBP
View
B
Retailer 12
-
£3,246 GBP
View
Most Expensive
Queensmith
6545684900 · Oct 28
£4,127 GBP
View
Price last confirmed 9 days ago
12 more retailers have this diamond
Prices start from £1,482 GBPSave up to £1,765 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
1.23ct Cushion
£1,482 GBP