3- Consulting specialised catalogues might be very useful, but consider that if a carpet is on a catalogue this is not a quality guarantee; on the other hand, a rug might be a precious one even if it does not appear on a catalogue. Moreover, when you consult a catalogue, you must consider that the size of the carpet images are often small and can deceive the people who look at it, especially in the case of people who are not expert.
4 – There are also more or less arbitrary criteria that can help you recognising a quality carpet, like the originality of the drawing, the quality of materials and colours, the epoch and place of origin. Be aware of the fact that in case of handmade rugs coming from some oriental village, the irregularities that you might find are not a sign of bad quality, on the contrary, in some cases this is an evidence of the fact that this is a handmade product.
5 – One might think that also the number of knots is an evidence of a quality carpet, but this is not an absolute rule, since there are also carpets that have many knots but are not precious, and in the same way there are rare and precious carpets with a low knot density.
6- Sometimes the carpets that have been realised by a famous artist bear the signature of their makers, but this is not a rule, as many Muslim artists prefer to remain anonymous to observe the humility precept of their creed. Also in the case of carpet bearing a signature you must be very careful in order to avoid scams: it is not difficult, indeed, to find carpets that have been recently realised but that bear the signature of a designer that died a long time ago; it is self-evident that they are fake.
7 – When you buy a carpet, you should always ask for a certificate of guarantee with the materials, the knot density, the epoch (in case of ancient carpets) and place of origin of the carpet. The perfect certificate should also contain a clear photo of the carpet and its price (if the receipt is missing – but it should not), and should be registered in your name. In this way, if you are robbed, if your house is flooded or whatever may happen and ruin your carpet, you will have the carpet guarantee and the necessary documentation to protect yourself.