Sterling Silver (SU): This indicates the item is made from sterling silver, an alloy of silver containing 92.5% silver and 7.5% copper.

925: This is a reference to the purity of the silver used in the item, which is 92.5%.

CZ: This stands for "cubic zirconia," which is a synthetic gemstone that resembles diamonds.

CH: This could have multiple meanings:

- "Chain": If the item is a necklace or bracelet, this could indicate it comes with a chain.

- "Charm": If the item is a charm, this could indicate it is designed to be attached to a bracelet, necklace, or similar item.

- "China": In some cases, "CH" may indicate the item was manufactured in China.

Without further context, it's difficult to provide an exact definition of "SU 925 CZ CH," but these are the most likely interpretations based on commonly used abbreviations in jewelry and manufacturing.