When the guests at Mary-Kate and Ashley Olsen's autumn/winter 2018 runway presentation for The Row left the fashion show, not only did they leave with memories of the fashion, but they also left with something a little more tangible.

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According to The Cut, the famous twins gifted their attendees with a crystal.

The report said that crystals were black or white and came with accompanying notes. The black crystal, for instance, "works in reducing fear and increasing focus" and also "repels and blocks negative energies." The white (or clear) crystal allegedly promotes harmony and would take balance "physical, mental, emotional, and spiritual planes."

The notes also allegedly included instructions on how to care for your newly-acquired crystal.

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While many may see this gift as somewhat strange, crystals are actually quite en vogue with many in the celebrity world.

Kim Kardashian West gave them to guests at her recent fragrance launch. Adele reportedly uses them for shows. Victoria Beckham allegedly hands them out before shows, too.

Of course, as any avid watcher of "The Hills" knows, Spencer Pratt was on the crystal game years ago, too.