Sterling silver can tarnish over time. To reduce this, store in a cool, dry place, preferably in a soft cloth pouch. Clean using a silver polishing cloth or a gentle mix of baking soda and water, and then rinse and dry thoroughly.

While 18K gold is durable, it's best to avoid exposing it to harsh chemicals. To clean, mix a few drops of mild dish soap with lukewarm water and gently brush with a soft toothbrush. Rinse with warm water and pat dry with a soft cloth.

Agate can be cleaned using lukewarm water and a soft brush. Avoid exposing it to strong detergents or chemicals. It's also sensitive to direct sunlight, so consider storing away from prolonged light exposure.

Like agate, onyx is best cleaned with lukewarm water and a soft brush. Avoid chemical cleaners, and always store in a soft pouch or jewelry box to prevent scratching.

Tiger eye should be handled gently, as it can easily scratch. Clean with lukewarm water, dry with a soft cloth, and store away from other gems and jewelry to prevent abrasions.

To maintain its sparkle, clean cubic zirconia with a mix of mild soap and water using a soft brush. Rinse it well and dry with a soft, lint-free cloth.

Avoid exposing mother of pearl to water or chemicals, as they can dull its sheen. Simply wipe down with a soft, damp cloth and dry immediately.

Diamonds may be tough, but they can still get dirty. Clean using warm soapy water and a soft brush. Make sure to rinse well and dry with a soft cloth.

General care for most gemstones involves avoiding harsh temperature changes and chemicals. Clean using lukewarm water, mild soap, and a soft brush. Always rinse thoroughly and pat dry. Remember, when wearing jewelry, it's always a good idea to remove them when doing tasks like gardening, cleaning, or swimming to ensure they remain in the best condition possible.