Selenite is much softer than many common gemstones and can scratch, chip or split if knocked or dropped onto a hard surface. Display pieces should therefore be supported securely rather than placed where customers can easily knock them from a shelf.

Use a soft, dry cloth or brush to remove dust and fingerprints. Avoid soaking, abrasive cleaners, scouring pads and vigorous rubbing, particularly around the engraved areas where repeated abrasion could gradually affect the finish.

They can show wear if the surface is repeatedly rubbed against harder objects. Because gypsum sits at only around 2 on the Mohs hardness scale, storing the knife separately from harder crystals, jewellery or metal accessories will help protect both the engraving and the polished surface.

Those uses belong to spiritual and ritual traditions rather than scientifically demonstrated effects. Retailers can explain the symbolism of cutting or releasing unwanted connections, but should avoid presenting emotional, energetic or health outcomes as guaranteed results.

A flat or slightly angled display with individual spacing is preferable to piling several pieces together. Keeping the knives from rubbing against each other reduces scratching, while a stable shelf or tray lowers the risk of drops and chipped points.