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Cushion|Natural|GIA

3.05ct J SI1 Cushion Natural Diamond

GD • J/SI1 • GIA 1558793905

Certificate GIA 1558793905

Diamond specifications and retailer prices

From £12,958 GBP
As of November 6, 2026
Save £4,524 GBP (26%) vs most expensive(unlock to see where)
8 retailers carry this diamond
Most expensive: £17,482 GBP at Blue Nile · As of October 31, 2026
View at Blue Nile

About this 3.05ct natural cushion diamond

This 3.05ct natural cushion sits in the three to five carat band, graded J colour (near-colourless) and SI1 clarity (slightly-included), with a standard cut grade stated by the retailer rather than the lab and certified by GIA 1558793905. Listed at 8 retailers as of October 31, 2026, with prices from £12,958 to £17,482, a £4,524 spread on the same certified stone. Blue Nile lists it at £17,482. Cut grade matters more than carat or clarity for visible brilliance. If you can shift budget toward an Excellent or Ideal cut, do it before chasing higher colour or clarity.

The 4Cs

3.05
Carat
J
Colour
SI1
Clarity
Good
Cut (retailer stated)

Specifications

Cut (retailer stated)Good
PolishExcellent
SymmetryExcellent
FluorescenceMedium
OriginNatural
Grading LabGIA
CertificateGIA 1558793905
Dimensions9.77 × 7.49 × 5.11 mm
L/W Ratio1.30
Top View
9.77 mm7.49 mm3.05 ctJ / SI1
OriginNatural
CutGood
PolishExcellent
SymmetryExcellent
FluorescenceMedium
CertificateGIA 1558793905
Side View
Table 62.0%CrownGirdle: THK-XTKPavilionCulet: NoneDepth 68.3%

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: £17,482 GBP|Low: £12,958 GBP|High: £17,547 GBP|Avg: £14,599 GBP|-0.4%
Blue Nile
Retailer 2
Retailer 3
Retailer 4
Retailer 5
Retailer 6
Retailer 7
November 6, 2026
Retailer 3£12,958 GBP
Retailer 2£12,989 GBP
Retailer 6£13,633 GBP
Retailer 5£14,467 GBP
Retailer 4£15,455 GBP
Retailer 7£16,335 GBP
Blue Nile£17,482 GBP

44 data points across 7 retailers

8 retailers£12,958 GBP to £17,482 GBP

A
Cheapest Retailer
-
£12,958 GBP
A
Retailer 2
-
£12,989 GBP
View
B+
Retailer 3
-
£13,633 GBP
View
Final sale: no returns
B+
Retailer 4
-
£14,366 GBP
View
Retailer 5
-
£14,467 GBP
View
Price last confirmed 26 days ago
B+
Retailer 6
-
£15,455 GBP
View
B
Retailer 7
-
£16,335 GBP
View
Most Expensive
B
Blue Nile
30380912 · Oct 31
£17,482 GBP
$23,400 USD
View
7 more retailers have this diamond
Prices start from £12,958 GBPSave up to £4,524 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
3.05ct Cushion
£12,958 GBP