This was my first making a mold:
I used Easy Mold Silicone Putty as the molding material and I love the results! The vintage flower charm is only 1.5cm wide but the molding material picked up those little details perfectly!
The only minus point is that this molding material cannot be used to cast objects or come into contact with materials that contain sulphur (eg. masking tape, clays and latex gloves or soap) else it won't cure properly. And I learnt that the hard way even though that was printed in the instruction sheet.. =P