642: I Quit My 15 Year Career To Build a Jewelry Business — and Hit $400,000 in My First Year

Mar 19, 2026

Rosie Collins, founder of Deja Marc, turned a Christmas epiphany into a personalized jewelry brand known for fingerprint and handwriting pieces. She built the product herself, found an “engraving fairy” to keep orders flowing, and scaled to $400K in year one while mastering operations. Topics include MER vs ROAS, Black Friday tactics that protect margins, unit economics, and balancing growth with family life.

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ANECDOTE

Christmas Epiphany Sparked Deja Marc

Rosie had a Christmas epiphany about baby shower gifts being for babies not moms and designed fingerprint and handwriting jewelry to celebrate mothers.
She sourced a supplier in January, learned engraving herself, bought machines still used today, and relied on an “engraving fairy” to pack orders while she worked full time.

ANECDOTE

Bought A Machine And Learned Engraving

Rosie bought an engraving machine overseas and taught herself to engrave while maintaining a demanding agency job.
She worked exhausted nights and used a local helper to engrave and pack orders during her workday for the first eight months.

ADVICE

Build A Simple P&L First

Treat unit economics and a simple P&L as foundational before scaling so revenue converts to real profit.
Aim for ~10–20% profit, allocate ~20–30% to marketing, then manage variable and fixed costs within those bands.

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