Gurudev !
A very good que. [disturbing to clarify per se compared to your grand knowledge in front of me I must add as PJ
1. Any DEED (Agreement) moresoever between spouses are done in "Non - Judicial Stamp Paper" and not on plain paper for Court validation when controversy if any errupts between party.
2. The validity of such DEED as per Stamp Paer Act is 6 months.
3. When wordings "jointly executed" comes between two spouses to their DEED (Agreement) then only Non Judicial Stamp Paper is used.
4. Rs. 100/- Non Judicial Stamp paper is used as per valuation clause under Stamp Duty Act per se matrimonial matters.
5. When under challenge / controversy arise the back of the Stamp Paper Stamp where "party who bought stamp paper" name appears resolves the fundamental contoversy to a part as "special knowledge and or as aware of intent and or as what is being written in front of same"
If above backburners are clear then allow me to throw light on your next very good logical que. and I take liberty to quote you;
"in this case are two lawyers, would they refuse tomorrow that the handover took place in their presence?"
Addendum reasonig I place before you: When controvery errupts in spousal conflicts to the nature of ornaments / goods return they (ld. respective Adv(s).) will not deny but if the controvery is in the nature of "good or worse condition of articles returned that also outside Court" then non Judicial Stamp Paper jointly executed and her name at the back of it and in Stamp Paper Vendor register having her initial / signature are all considered on merit to resolve such post constroversies one after another in sequence!
Now allow me to take a minor dig onto you :-)
Suppose the alleged gold ornaments returned outside court in presence and signature of respective ld. Adv. turned bad, will respective Adv. vouch under Oath that "nahi ji woh saab sahi they, khara sona tha ji, mere samney diya tha aur inhoney liya tha kar key" Well ld. friend all they will say is that articles (no. of pieces) handed by husband to wife in our presence and our signature as witness at Mark A or B are correct!
Well in that case my previous reply to author I still stand as cautious and correct practice. I hope I stand clarified onto your 'minor dig' on previous reply post of mine!.
All the best............