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"Owned" is a form of "own", a transitive verb which is often translated as "ser dueño de". "Belong" is an intransitive verb which is often translated as "ser de". Learn more about the difference between "belong" and "owned" below.
belong(
bi
-
lang
)An intransitive verb is one that does not require a direct object (e.g., The man sneezed.).
a. pertenecer a 
It's not compulsory to belong to this association in order to become a politician.No es obligatorio pertenecer a esta asociación para llegar a ser político.
a. ser de 
This pin belongs to my earring; I had lost it.Esta barrita es de mi pendiente; se me había perdido.
b. pertenece a 
This button belongs to the pirate costume.Este botón le pertenece al disfraz de pirata.
a. ir 
The cutting board for the fish belongs in the right cabinet.La tabla de cortar pescado va en el armario de la derecha.
5. (to fit in)
a. encajar 
It's the first time that I feel that I belong in a group.Por primera vez siento que encajo en un grupo.
own(
on
)A transitive verb is a verb that requires a direct object (e.g., I bought a book.).
1. (to possess)
a. ser dueño de 
He owns six apartments in this building and several more elsewhere.Es dueño de seis apartamentos en este edificio y varios más en otros lugares.
c. tener 
Our family owns four bicycles but only one works.En casa tenemos cuatro bicicletas, pero solo una funciona.
2. (formal) (to admit)
A word or phrase used to refer to the second person formal “usted” by their conjugation or implied context (e.g., usted).
An intransitive verb is one that does not require a direct object (e.g., The man sneezed.).
3. (formal) (to admit; used with "to")
A word or phrase used to refer to the second person formal “usted” by their conjugation or implied context (e.g., usted).
An adjective is a word that describes a noun (e.g., the big dog).
A pronoun is a word that stands in for a noun (e.g., she).
5. (possessive)
a.  no direct translation
This refers to an idiomatic word or phrase for which there is no word-for-word translation.
Do you know if the dog is her own?¿Sabes si el perro es suyo?
Do you need swimming goggles? - No, thank you. I've brought my own.¿Necesitas gafas de natación? - No, gracias. Traje las mías.