Authenticity & Assurance
Every piece we sell is personally examined and authenticated by a trained gemologist before it is ever listed — then delivered to you fully insured, signature-required, with a certificate of authenticity.
When you buy estate jewelry online, one question matters more than any other: is it real, and is it what it says it is? At Bizak & Co., nothing is listed sight-unseen. Every ring, watch, and piece in the collection is examined in person and authenticated by a trained gemologist before it goes online — watches are additionally checked by a watchmaker for movement and function — and it reaches you documented, insured, and exactly as described.
Authentication is carried out in-house by Arkadius Bizak, with gemmological training through HRD Antwerp and ERIJ, three decades in Miami's jewelry trade since 1996, and three generations of gemologists behind the name.
How every piece is verified
Examined in person
Each piece is inspected under the loupe by a trained gemologist before listing — metal, stones, hallmarks, and maker's marks are all checked. Nothing goes online unseen.
Independent lab reports
Where a stone carries a laboratory report — such as a GIA report — the report and its number are stated on the product page, not just implied.
Certificate of authenticity
Every piece ships with a certificate of authenticity and its gemological description, so what you were told is what you own.
Signatures stated plainly
A signed piece is described as signed; an unsigned piece is described as unsigned. We never let a screw motif pass for a house it isn't.
Exact specifics listed
Carat weights, metal purity, and dimensions are listed as measured — not rounded up to flatter the piece.
Appraisal on request
Want it in writing, or verified elsewhere? An appraisal is available on request, and you're free to have any piece checked by an independent gemologist.
How your piece reaches you
Confirm your piece
Reserve online or over WhatsApp. A secure payment link is sent only after your order is confirmed — never before.
Documented & packed
Your piece is packed in a Bizak & Co. presentation box with its certificate of authenticity and gemological description.
Fully insured transit
It ships fully insured and signature-required, so your purchase is protected the entire way to your door.
Verify for yourself
Have it appraised or examined by any independent gemologist you choose. Exact specifics are listed so there are no surprises.
Frequently Asked Questions
Is every piece authenticated before it is listed?
Yes. Every piece in the collection is personally examined and authenticated by a trained gemologist before it is ever listed for sale. Nothing goes online sight-unseen.
Does my purchase come with a certificate of authenticity?
Yes. Each piece ships with a certificate of authenticity and its gemological description. Where a stone carries an independent laboratory report, such as a GIA report, that report and its number are referenced on the product page.
Who authenticates the jewelry?
Authentication is carried out in-house by a trained gemologist — Arkadius Bizak, with gemmological training through HRD Antwerp and ERIJ, three decades in Miami's jewelry trade since 1996, and three generations of gemologists behind the name.
How is my piece shipped?
Each piece ships in a Bizak & Co. presentation box, fully insured and signature-required, with its certificate of authenticity. A secure payment link is sent only after your order is confirmed.
Can I have the piece independently appraised?
Absolutely. An appraisal is available on request, and you are always free to have any piece verified by an independent gemologist of your choosing. We list exact carat weights and specifics so there are no surprises.
Are the stone weights and details exact?
Exact carat weights and specifics are listed on each piece. Where a piece is signed by a house or accompanied by a laboratory report, that signature or report is stated plainly rather than implied.
Buy with confidence
Have a question about a specific piece — its stones, its papers, its maker? Ask before you buy. We'd rather you be certain.