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Cushion|Natural|GIA

1.05ct J SI1 Cushion Natural Diamond

EX • J/SI1 • GIA 6511232942

Certificate GIA 6511232942

Diamond specifications and retailer prices

From £1,761 GBP
A$3,635 AUD
As of November 2, 2026
Save £982 GBP (36%) vs most expensive(unlock to see where)
6 retailers carry this diamond
Most expensive: £2,743 GBP at 77 Diamonds · As of November 2, 2026
View at 77 Diamonds

About this 1.05ct natural cushion diamond

This 1.05ct natural cushion sits in the classic one-carat band, graded J 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 6511232942. Listed at 6 retailers as of November 2, 2026, with prices from £1,761 to £2,743, a £982 spread on the same certified stone. 77 Diamonds lists it at £2,743. 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

1.05
Carat
J
Colour
SI1
Clarity
Excellent
Cut (retailer stated)

Specifications

Cut (retailer stated)Excellent
PolishExcellent
SymmetryExcellent
FluorescenceNone
Crown angle33.84°
OriginNatural
Grading LabGIA
CertificateGIA 6511232942
Dimensions7.08 × 5.45 × 3.69 mm
L/W Ratio1.30
Top View
7.08 mm5.45 mm1.05 ctJ / SI1
OriginNatural
CutExcellent
PolishExcellent
SymmetryExcellent
FluorescenceNone
CertificateGIA 6511232942
Side View
Table 61.0%Crown 33.84°Girdle: MED-THKPavilionCulet: NoneDepth 67.7%

Caratlytics Score

How it works →
B+
Very Good
Strong quality and value balance
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Price History

Last verified: Nov 2
Current: £2,743 GBP|Low: £1,679 GBP|High: £2,749 GBP|Avg: £2,110 GBP|+2.0%
77 Diamonds
Retailer 2
Retailer 3
November 2, 2026
Retailer 3£1,799 GBP
Retailer 2£1,847 GBP
77 Diamonds£2,743 GBP

37 data points across 3 retailers

6 retailers£1,761 GBP to £2,743 GBP

B+
Cheapest Retailer
-
£1,761 GBP
A$3,635 AUD
B
Retailer 2
-
£1,785 GBP
$2,396 USD
View
B
Retailer 3
-
£1,799 GBP
$2,414 USD
View
B
Retailer 4
-
£1,847 GBP
$2,478 USD
View
Final sale: no returns
B
Retailer 5
-
£1,908 GBP
$2,560 USD
View
Most Expensive
B
77 Diamonds
CUSDHY3SAUEMT · Nov 2
£2,743 GBP
View
5 more retailers have this diamond
Prices start from £1,761 GBPSave up to £982 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+
1.05ct Cushion
£1,761 GBP