Miami's Diamond District · Nationwide by Mail · Since 1996
Rooted in Miami's Diamond District. Available Anywhere.
Bizak & Co. works from the Seybold Building — the center of Miami's diamond trade — and serves customers across the United States online and by insured mail. Estate jewelry, vintage watches and honest valuations, from a family that has been in this trade for three decades.
Why the diamond district matters — even by mail
The Seybold Building is where Miami's jewelry trade actually happens — one of the largest jewelry centers in the country, hundreds of independent jewelers across ten floors in downtown Miami. It's the difference between a mall counter and the source.
Bizak & Co. is one of those jewelers — a family business, in this trade since 1996. Being inside the district is what lets us offer real estate pieces at trade-level pricing and back every valuation with genuine expertise. And because we work online and by insured mail, you get that access from anywhere in the U.S. — no counter, no pressure, no travel.
Everything we do — from anywhere
Estate Jewelry
One-of-a-kind pieces, honestly described and gemologically examined. Shop and buy online.
Browse the collection →Vintage Watches
Serviced, authenticated timepieces, priced with full transparency. Shipped insured.
See watches →Sell Gold, Diamonds & Watches
Mail it in with free insured shipping. Valued piece by piece, paid the same day.
Sell to us →Repairs — BizakAid
Mail-in jewelry repair by master jewelers, returned fully insured.
Repairs by mail →How it works — no visit required
Reach out online
Browse the collection, or start a sale or repair through the site or WhatsApp — from anywhere.
Free insured shipping
Selling or repairing? We send a prepaid, fully insured label — you never pay to ship.
Real expertise
A jeweler from the district examines and values every piece, and puts it in writing.
Delivered to your door
Purchases, offers and repairs handled remotely and shipped insured, both ways.
Seybold Building FAQ
Do I have to come to Miami to buy or sell?
No. We serve customers across the U.S. online and by insured mail. You can browse and buy estate pieces online, or sell gold, diamonds and watches by mail with free insured shipping — all without traveling.
Is Bizak & Co. a real jeweler in the Seybold Building?
Yes — a family jeweler based in the Seybold Building since 1996, three generations in the trade. You deal directly with the family, not a middleman.
Why buy from a diamond-district jeweler instead of a chain store?
The Seybold Building is the center of Miami's diamond trade. Buying from a jeweler inside the district means trade-level sourcing and pricing and honest gemological descriptions — and with us you get that from anywhere in the country.
How do I sell my jewelry to you if I'm not in Miami?
Request a free, insured shipping kit, mail your gold, diamonds or watches, and a gemologist or watchmaker values each piece and sends a written offer. Accept and you're paid the same day; decline and everything ships back free.
What does the Seybold Building have to do with buying online?
It's where our inventory and pricing come from. Being an established jeweler inside the country's largest jewelry center is what lets us offer real estate pieces at trade-level prices online, with the same expertise behind every valuation.
The district, delivered
Shop estate pieces, sell by mail, or ask us anything — all online, from anywhere in the country.