Jewellery relies on its good looks to make up for its bad behaviour—from pocket watches' incorrigible clam impersonations to the cruel blindings perpetrated by large-carat diamonds. Keep valuable trinkets in line with today's Groupon to Seropian Jewellery in Cambridge. Choose from the following options:

• For $15, you get three jewellery items cleaned, shined, and polished (a $30 value).
• For $40, you get $90 worth of jewellery repairs and services.

For more than 25 years, Seropian Jewellery has kept baubles shimmering with professionally administered jewellery services. Wrest grandma's antique brooch and two other sullied items from selfish children playing dress-up for a thorough cleansing by one of Seropian's expert gem scrubbers. Should fit or breakage prevent wear, customers can let one of Seropian's jewellers perform a bling tune-up by making any necessary repairs. Chain soldering ($10+) can keep necklaces properly slung, and a ring sizing ($15+ for one size down; $20+ for one size up) can see to it that pirate-slang decoder rings fit snugly for a lifetime. Specializing in the setting of precious stones, Seropian can skillfully re-tip claws ($10 each) to ensure gems stay in their rightful places. Rings can further be treated to a replating ($50), and those who have been chronically late to their time-traveller's club meetings can have watch batteries changed ($3). Boasting an on-site goldsmith, Seropian Jewellery can perform many services in minutes.