Before landing, here's what you need to do (even if your jewelry is old, passed through family and have no receipt):
Print photographs of 2 to 4 items per page. Each photograph should have an estimated value written under it. YOU NEED TO PRINT TWO SETS.
Take all of your jewelry to your local jeweler and get them valued as per amount of gold, in carats (with current gold rates written in it). Same goes for any other expensive stone/metal/etc. Jewelers may charge for such services, but if you know them well, they would do it for free. It's called 'Jewelry Appraisal'.
Upon landing, give both sets of Form B4 (and B4A if any) to CBSA officer along with both sets of jewelry photographs and estimated valuation record paper/receipt you got from jeweler. Just make sure you mention jewelry together as a group (don't mix it with other stuff) in B4 Form.
One of the Set will be retained by CBSA Officer and other set will be STAMPED, SIGNED and RETURNED back to you. CBSA Officer will also put a stamp at the back of your COPR which will have reference to your list they have retained with them.
Note: There's no specific format. Create format of your own. They will accept it.
Describe each item of jewellery you plan to bring into Canada on the list of goods you submit. Since jewellery is difficult to describe accurately, it is best to use the wording from your insurance policy or jeweller's appraisal and to include photographs that have been dated and signed by jeweller or gemologist. This makes it easier to identify the jewellery when you first enter Canada, and later when you return from abroad with the jewellery.
You may get more replies on your posted question on the link below because you have greater audience (not just Pakistanis) over there :