The Private Diamond Club only presents you, as a safe investment, with the rarest diamonds, those with the best criteria :

 Weight: Between 0.50 and 1.50 Carat
 Colours: D - E and F
 Clarity: Flawless, VVS1 and VVS2
 Proportions: Very Good or Good
 Finish: Very Good or Good
 Degree of Fluorescence: Nil or Low (diamonds with no fluorescence are the rarest)

 As safe investments, diamonds present several characteristics:

 They are unalterable
 They are discreet as they provide the means of keeping the strongest value in the smallest volume and weight (5 carats of diamonds, i.e. one gram, are equivalent to several kilograms of gold)
 They are likely to increase in value in time over long periods.
 They do not require any specific management. They are generally kept in a safe.

Diamonds are forever beautiful, unique and eternal.