I based Spinel's dress on Hittite women's attire, as Vozolaz's culture was inspired by a mix of Hittite, Russian, and Thai art.
In ancient Vozolaz, spinel gems were so common and quick-growing, that they were used as currency. As they grew from the earth, the wights (spirits) of the earth were sometimes worshipped for wealth and good luck, and idols of them were sometimes depicted holding a bowl of spinels to symbolise good fortune. In fact, according to Vozonid mythology, spinels were also used by earth wights as their own currency, even long after Vozolaz has switched to bank notes and coinage since Emperor Wantozil's modernisation.
Considering that Gems from Steven Universe are associated with minerals, and minerals come from the ground, the alien Spinel might as well be an earth wight from another world, although she was artificial. If she existed in Vozolaz, she would be revered as a bringer of wealth -- and laughter.