But everybody's like Cristal, Maybach, diamonds on your timepiece
Jet planes, islands, tigers on a gold leash
Lorde states the material things that signify wealth.
Most likely “Cristal” is referring to the Champagne, not crystal meth, considering that what she mentions next is Maybach, a luxury car.
Of note, LORDE says she greatly admires the lyric writing of Ezra Koenig of Vampire Weekend, who writes almost exclusively on these themes. Like Koenig, she uses rap tropes she genuinely admires as a listener in order to undermine them as an observant pop sociologist amateur.
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