Here are several types of phone cases with amulet designs, talismans, or lucky charms

. You can find these items on sites like yantmagic.com, or from specialty brands like CaseClub in Thailand.

These cases feature symbols of good fortune or protection printed directly onto the case material. 

Yant Kro Phet  (Diamond Armor Yantra)

Design Details:

At the heart of the yantra lies a radiant Eight-Directional Mandala, surrounded by a powerful Eight-Directional Diamond Armor Barrier. The four corners are fortified with the powerful Nine-Spired Yantra, while symbols of wealth bags (silver and gold) are placed at all eight directional points.

The yantra is framed within a perfect square, representing completeness and stability.

Blessings of Chatura Phithi Phon Chai (The Fourfold Auspicious Blessings):

This sacred design bestows the four ultimate blessings:

Yant Kro Phet

(Thai: ยันต์เกราะเพชร), or the Diamond Armor Yantra, is a revered and potent Sak Yant (Thai sacred tattoo) design in Thai culture. It is primarily known for providing powerful protection from danger, harm, evil spirits, and black magic, essentially acting as an "invisible cloak".

Protection: The central purpose of the Yant Kro Phet is to create a spiritual shield for the wearer, deflecting physical perils, bad luck, and dark energies. The design resembles a shield or armor, reflecting its function as a protective barrier.

Blessings and Good Fortune: Besides protection, it is believed to attract good luck, wealth, success in business, and general well-being.