Mother-daughter design duo Lisa and Brittny Gastineau launched their high-end jewelry line Tres Glam last year, and now they're expanding their jewelry empire with "Gastineau Glamour," a lower-priced collection sold exclusively on HSN.

Brittny (above, in a new photo shoot for their jewelry) and her mom will debut the collection on HSN on March 21 at 2 a.m. and 9 p.m.

The inaugural collection includes estate-inspired looks and boho chic designs, ranging from couture-inspired necklaces and earrings, to rings, cuffs and bracelets. Pieces are priced below $200.

"My mom and I have always been extremely close and that will quickly become apparent when we appear on HSN, Brittny said. "We can't wait to share the inspirations behind the designs and be able to demonstrate to a large audience the passions we have for jewelry."

And Lisa added, "I've always had an eye for dressing and accessorizing, and Brittny and I are excited to bring our collection to life when we appear on HSN."