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Cushion|Natural|GIA

3.11ct J SI1 Cushion Natural Diamond

EX • J/SI1 • GIA 2557313921

Certificate GIA 2557313921

Diamond specifications and retailer prices

From £18,385 GBP
As of November 6, 2026
Save £10,143 GBP (36%) vs most expensive(unlock to see where)
8 retailers carry this diamond
Most expensive: £28,528 GBP at MOH London · As of November 2, 2026
View at MOH London

About this 3.11ct natural cushion diamond

This 3.11ct natural cushion sits in the three to five 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 2557313921. Listed at 8 retailers as of November 2, 2026, with prices from £18,385 to £28,528, a £10,143 spread on the same certified stone. MOH London lists it at £28,528. 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

3.11
Carat
J
Colour
SI1
Clarity
Excellent
Cut (retailer stated)

Specifications

Cut (retailer stated)Excellent
PolishExcellent
SymmetryExcellent
FluorescenceNone
OriginNatural
Grading LabGIA
CertificateGIA 2557313921
Dimensions9.76 × 7.56 × 5.09 mm
L/W Ratio1.29
Key to symbols
Crystal, Feather
Top View
9.76 mm7.56 mm3.11 ctJ / SI1
OriginNatural
CutExcellent
PolishExcellent
SymmetryExcellent
FluorescenceNone
CertificateGIA 2557313921
Side View
Table 64.0%CrownGirdlePavilionCulet: NoneDepth 67.3%

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 6
Current: £28,528 GBP|Low: £18,200 GBP|High: £28,871 GBP|Avg: £21,183 GBP
MOH London
Retailer 2
Retailer 3
Retailer 4
Retailer 5
Retailer 6
Retailer 7
Retailer 8
November 6, 2026
Retailer 8£18,200 GBP
Retailer 4£18,385 GBP
Retailer 6£18,703 GBP
Retailer 5£19,322 GBP
Retailer 7£19,619 GBP
Retailer 2£22,037 GBP
Retailer 3£23,515 GBP
MOH London£28,528 GBP

44 data points across 8 retailers

8 retailers£18,385 GBP to £28,528 GBP

Retailer 1
-
£18,200 GBP
Price last confirmed 12 days ago
B+
Retailer 2
-
£18,385 GBP
View
Retailer 3
-
£18,703 GBP
View
Price last confirmed 34 days ago
B+
Retailer 4
-
£19,322 GBP
View
Final sale: no returns
B+
Retailer 5
-
£19,619 GBP
View
B
Retailer 6
-
£22,037 GBP
View
B
Retailer 7
-
£23,515 GBP
View
Most Expensive
B
MOH London
20E309C75 · Nov 2
£28,528 GBP
View
7 more retailers have this diamond
Prices start from £18,385 GBPSave up to £10,143 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+
3.11ct Cushion
£18,385 GBP