Loose Diamonds like MQ-5009 

Cleaning Your Diamond Rings & Jewelry Use a solution of six parts water and one part ammonia. Some charms or pendants represent the religious leanings of the wearer. Silver charms are also used to commerate life events such as births, weddings, anniversaries, birthdays, or graduations.

For my money, I believe the best choices are quality Moissanite stones or the new diamond simulant gemstones available from Diamond Nexus Labs. Charms are also known as amulets and pendants. Others were made with gemstones inlaid in them or mounted with precious metals in the form of necklaces, crowns, staffs, and bracelets.