CaratHunter
Plans
Cushion|Natural|GIA

4.06ct K SI1 Cushion Natural Diamond

ID • K/SI1 • GIA 6555389479

Certificate GIA 6555389479

Diamond specifications and retailer prices

From £18,513 GBP
As of November 6, 2026
Save £15,885 GBP (46%) vs most expensive(unlock to see where)
5 retailers carry this diamond
Most expensive: £34,399 GBP at MOH London · As of November 4, 2026
View at MOH London

About this 4.06ct natural cushion diamond

This 4.06ct natural cushion sits in the three to five carat band, graded K colour (faint-tinted) and SI1 clarity (slightly-included), with a top-tier cut grade stated by the retailer rather than the lab and certified by GIA 6555389479. Listed at 5 retailers as of November 4, 2026, with prices from £18,513 to £34,399, a £15,885 spread on the same certified stone. MOH London lists it at £34,399. 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

4.06
Carat
K
Colour
SI1
Clarity
Ideal
Cut (retailer stated)

Specifications

Cut (retailer stated)Ideal
PolishExcellent
SymmetryExcellent
FluorescenceFaint
OriginNatural
Grading LabGIA
CertificateGIA 6555389479
Dimensions10.83 × 8.28 × 5.62 mm
L/W Ratio1.31
Key to symbols
Crystal, Feather, Cloud, Needle
Top View
10.83 mm8.28 mm4.06 ctK / SI1
OriginNatural
CutIdeal
PolishExcellent
SymmetryExcellent
FluorescenceFaint
CertificateGIA 6555389479
Side View
Table 63.0%CrownGirdle: STK-THKPavilionCulet: NDepth 67.8%

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: £34,399 GBP|Low: £18,513 GBP|High: £36,280 GBP|Avg: £24,836 GBP|-5.1%
MOH London
Retailer 2
Retailer 3
Retailer 4
Retailer 5
Retailer 6
November 6, 2026
Retailer 2£18,513 GBP
Retailer 6£20,819 GBP
Retailer 4£21,926 GBP
Retailer 5£23,133 GBP
Retailer 3£26,816 GBP
MOH London£34,399 GBP

20 data points across 6 retailers

5 retailers£18,513 GBP to £34,399 GBP

A
Cheapest Retailer
-
£18,513 GBP
A
Retailer 2
-
£21,926 GBP
View
A
Retailer 3
-
£23,133 GBP
View
A
Retailer 4
-
£26,816 GBP
View
Most Expensive
B
MOH London
BA8C7A854 · Nov 4
£34,399 GBP
View
4 more retailers have this diamond
Prices start from £18,513 GBPSave up to £15,885 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
4.06ct Cushion
£18,513 GBP