Cal. Civ. Code § 3052a
Every person, firm, or corporation, engaged in performing work upon any watch, clock or jewelry, for a price, shall have a lien upon the watch, clock, or jewelry for the amount of any account that may be due for the work done thereon. The lien shall also include the value or agreed price, if any, of all materials furnished by the lienholder in connection with the work. If any account for work done or materials furnished shall remain unpaid for one year after completing the work, the lienholder may, upon 30 days notice in writing to the owner, specifying the amount due, and informing him that the payment of the amount due within 30 days will entitle him to redeem the property, sell any such article or articles at public or bona fide private sale to satisfy the account. The proceeds of the sale, after paying the expenses thereof, shall first be applied to liquidate the indebtedness secured by the lien and the balance, if any, shall be paid over to the owner.
The notice may be served by registered mail with return receipt demanded, directed to the owner's last known address, or, if the owner or his address be unknown, it may be posted in two public places in the town or city where the property is located. Nothing herein contained shall be construed as preventing the lienholder from waiving the lien herein provided for suing upon the amount if he elects to do so.
Ca. Civ. Code § 3052a