Assay Jewelry

Assay Jewelry Rare gems. Rare watches. Real knowledge. ASSAY is a curator of certified colored gemstones, diamonds and luxury watches with provenance.

We source pieces you won't find anywhere else — and we've been doing it since 1983. GIA Graduate Gemologist on staff.

Vintage Rolex Cellini 3807 in 18K gold with a champagne dial and textured bracelet. Clean, warm, and quietly elegant.POT...
06/11/2026

Vintage Rolex Cellini 3807 in 18K gold with a champagne dial and textured bracelet. Clean, warm, and quietly elegant.

POTC2625W- available for direct purchase on our website while supply lasts

06/10/2026

One of the rarest sapphire colors in the world. The legendary Padparadscha Sapphire. Certified and unheated from Sri Lanka. 🇱🇰

It’s now sold and no longer available.

Vintage Omega De Ville in 18K gold with a matching gold bracelet and classic champagne dial. Elegant, understated, and a...
06/10/2026

Vintage Omega De Ville in 18K gold with a matching gold bracelet and classic champagne dial. Elegant, understated, and a beautiful example of timeless Swiss watch design.

POTC2008W- available for direct purchase on our website while supply lasts

06/09/2026

How to tell if you have lab grown or a natural diamond

Use a loupe and check the girdle.

• Many lab grown diamonds have a laser inscription
• Most start with “LG” or say “Lab Grown”
• Natural diamonds may have a GIA inscription or no inscription at all

It’s not foolproof, but it’s one of the fastest checks you can do yourself.

Cartier Tank Française Large 28mm with a two tone case and bracelet, silver guilloché dial, bold Roman numerals, and aut...
06/09/2026

Cartier Tank Française Large 28mm with a two tone case and bracelet, silver guilloché dial, bold Roman numerals, and automatic movement. A timeless design that remains one of Cartier's most recognizable watches.

#3066-available for direct purchase on our website while supply lasts

Rolex Daydate 36mm in 18K gold with a fluted bezel, champagne tapestry dial, and Presidential bracelet. A classic for a ...
06/09/2026

Rolex Daydate 36mm in 18K gold with a fluted bezel, champagne tapestry dial, and Presidential bracelet. A classic for a reason.

POTC2632W- available for direct purchase on our website while supply lasts

06/08/2026

This green isn’t just rare… it’s elite. 💚

Imperial jadeite jade is one of the most expensive gemstones on earth.

And it’s not just about color.

It’s the combination of:

- Rich green
- Glowy luster
- Smooth texture
- Perfect uniformity
- Most importantly, untreated.

Almost no jade has all of these at once.
That’s why it’s one of the most desired gemstones in the East.

SKU - GA0417

Vintage Bucherer in 18K gold with a clean dial and brown leather strap. Simple, classic, and quietly elegant ...
06/07/2026

Vintage Bucherer in 18K gold with a clean dial and brown leather strap. Simple, classic, and quietly elegant

Vintage Rolex Thunderbird with a two tone case, warm dial, and that bold Turn-O-Graph bezel. Classic Datejust feel with ...
06/06/2026

Vintage Rolex Thunderbird with a two tone case, warm dial, and that bold Turn-O-Graph bezel. Classic Datejust feel with a little more personality.

06/05/2026

How To Test If Gold Is Real At Home

A $30 acid test kit can tell you whether your gold is real and help estimate its purity.

• Scratch the metal onto the testing stone• Apply the corresponding acid
• If the gold mark remains, the metal is that purity or higher
• If it disappears, it’s lower purity or not gold at all

Simple, inexpensive, and one of the fastest ways to screen gold before deeper testing.

Address

169 East Flagler Street
Miami, FL

Telephone

+13057883019

Website

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