J.J. & Co. fine diamond jewelry — ring, earrings, necklace and tennis bracelet on stone with silk

Hand-selected stones

Every diamond reviewed by our gemologists.

Natural & lab-grown

Two paths to the same brilliance.

Made for you

Bespoke pieces, designed alongside you.

Lifetime care

Free polishing and cleaning, always.

The Collection

Pieces with intent.

Jeweler crafting a custom diamond ring
Bespoke

Designed with you, made for one.

An engagement, an anniversary, a milestone of your own — bring us a memory and we'll translate it into metal and stone. Our designers guide you from sketch to setting, with full transparency at every step.

Start a custom piece
@jjandcofinejewelry

Live from the atelier.

New stones, behind-the-bench moments, and pieces in progress — shared daily. Come say hello.

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Private Appointment

Visit us in Los Angeles.

Book an appointment