Thanks for the ID Moh'd. I just cracked open 3 stones and got 2 whole seeds. I hope they are not damaged. I have placed them on top of the soil as Useful Tropical Plants say it needs light to germinate. If they germinate successfully, I might try to exchange them with other members, instead of trying to send whole stone
Ziziphus Mauritiana seedling does not grow true to the mother tree and seedlings are usually inferior to named cultivar similar to date palm. Get a grafted Ziziphus Mauritiana plant, trust me.
However, Ziziphus spina-christi can be grown from seeds and the fruits are really good almost as good as the mother tree even for a seedling.