About · founder story
A family-run counter inside Superior Grocers, Corona, CA.
Franzia Diamonds is the diamond counter you happen upon while picking up groceries — and walk out of an hour later with a GIA-graded natural stone, an IGI-graded lab-grown stone, or a custom build on the bench. This is the story behind that counter, the people at it, and how we source what lands on it.
The Franzia family
Operators of the Franzia Diamonds counter · Family-run since the first stone on the case
02 · Founder story
The counter, the bench, the report.
Franzia Diamonds is a family-run counter inside Superior Grocers, Corona, CA — the same shop you walk past on a grocery run becomes the place you sit down with a loupe, a GIA report, and an honest conversation about what makes a stone worth taking home.
We stock both natural and lab-grown diamonds side by side, deliberately — not as substitutes for each other but as two valid answers to two different questions. A natural diamond is graded by GIA; a lab-grown diamond is graded by IGI. The lab lives in the listing, and the report travels with the stone from the bench that grades it into your hand.
Custom building happens at the same counter, not a separate process. Bring a setting from a different jeweler, an inspiration photo, or just the question you came in with — and we will walk you through the bench process: stone selection, metal, side profiles, engraving, and a realistic production window before you commit to anything.
We believe the best diamond purchase is one where the report and the stone travel together, where the supplier chain is short enough to introduce in person, and where a return is a conversation instead of a ticket. That is what we have tried to build at the Franzia Diamonds counter, and that is the standard we hold every stone on the case to.
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What we hold at the counter
Three standards every stone on the case has to clear.
GIA + IGI grading at the bench
Every natural stone ships with its original GIA packet; every lab-grown stone ships with its original IGI packet. The report is part of the stone and stays with it from the supplier to your hands.
Family-run, direct wholesale
Vetted suppliers we have worked with for years. Stones bought individually for cut quality, not pulled from a parcel — which is what lets us pass outlet pricing through to the counter.
In person, before you decide
See the stone under the loupe at the Franzia Diamonds counter inside Superior Grocers, Corona, CA before any commitment. A custom ring or a same-day ring both start with the same honest conversation — descriptive language, no sales-call runway.
03 · Visit the Franzia Diamonds counter
Come see the case in person.
Stop in during store hours, no appointment necessary for browsing. For custom builds, stone-specific questions, or a quiet hour at the loupe, reach the counter ahead of time and we will hold the case open for you.
Store location
Franzia Diamonds
Inside Superior Grocers, Corona, CA
<STREET ADDRESS, e.g. 123 Main St>
Corona, CA <ZIP>
<PHONE>·Franziadiamonds@yahoo.com
Store hours follow Superior Grocers, Corona, CA. Walk-ins welcome; appointments recommended for custom-build consultations.
Ready to browse
The same chain that ran the counter — now over on the feed.
Skip the sales-call runway. Browse the certified feed, see the GIA and IGI reports inline, and pick the stone that's right for the question you came in with.
Franzia Diamonds · inside Superior Grocers, Corona, CA