Admittedly, you may not covet everything your mom has. Her proclivity to nag? Thanks, but no thanks. The suburban helmet hair? Uh, ick. The fixation on Yanni? Pray it isn’t genetic.

But her honkin’ cocktail ring with yellow diamonds and emeralds? Now that’s an heirloom of a different color. Would that add some serious bling to your hand, or what?

Alas, it’s not quite yours. (Yet, anyway.)

So try this: Borrow it for a day (yes, you have to ask first), take it to Alpha Omega Jewelers, and design your own. For a fraction of the cost of Mom’s bauble, they’ll custom-construct its likeness — but in semiprecious rocks (like yellow sapphires, garnets, and topaz), instead of pricier diamonds, rubies, and so on.

And there you have it: your very own sparkler — without the wait or the expense.

Before long, Mom may be coveting something you have: dazzling ingenuity.

Alpha Omega, 1380 Massachusetts Avenue, Harvard Square (617-864-1227 or alphaomegajewelers.com).