Black Pearl of Queens

The Brownstone
Collection

Colored by the earth.
Built for New York.

Shop the Collection What are cognac diamonds? →

Natural Cognac & Champagne Diamonds  ·  Solid 14K Gold & Platinum  ·  Handcrafted NYC

Why The Brownstone Collection

Natural diamonds. A different kind of rare.

There is a particular warmth to the streets of New York City that no other city in the world replicates. The honey-toned facades of century-old brownstones lining the blocks of Brooklyn, Harlem, and Queens — buildings that have outlasted every trend, every shift in the city’s identity. That warmth is what this collection is built around.

Cognac and champagne diamonds get their color from nitrogen molecules trapped inside the crystal during formation — a geological process that took billions of years and cannot be replicated. Every stone is different. No two are the same shade. This is not a style. This is geology.

Read the complete guide →
C1–C7The Argyle color scale from light champagne to deep cognac
2020The year the Argyle Mine closed, making these stones finite
10Mohs hardness — the hardest natural material on earth, built for daily wear
2–3 wksMade to order in our NYC workshop in your exact size and metal

The Argyle Color Scale

Champagne to Cognac — C1 to C7

Seven round brilliant cut diamonds showing the Argyle C1 to C7 color scale from pale champagne to deep cognac brown
Light Champagne Champagne Medium Dark Champagne Light Cognac Cognac Deep Cognac
← Champagne (C1–C4) Cognac (C5–C7) →
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Natural Diamonds

Every stone is a natural cognac or champagne diamond. Geological color formed over billions of years. Not lab-grown. Not treated. Not enhanced.

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Handcrafted in NYC

Set by hand in our New York City workshop. Jewelry has been in our family for over two generations. No shortcuts, no mass production.

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Made to Order

Your piece is made specifically for you in your exact size and metal. 2–3 weeks production. Ships free and fully insured in our signature gift box.

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Lifetime Warranty

Every Brownstone piece is backed by our lifetime warranty against manufacturing defects. Real stones. Real gold. Real backing.

Everything You Want to Know

Are these natural or lab-grown diamonds?

Every diamond in The Brownstone Collection is a natural diamond — not lab-grown, not treated, not enhanced. The warm cognac and champagne tones are geological, formed over billions of years under conditions that will never repeat. This is our premium natural tier, priced above our lab-grown white diamond collection to reflect the rarity of these stones.

What is the difference between cognac and champagne diamonds?

Both are natural fancy color diamonds on the Argyle C1–C7 scale. Champagne (C1–C4) is lighter, more golden — warm, versatile, beautiful in rose gold. Cognac (C5–C7) is deeper amber-orange — bold and warm, striking in yellow gold or platinum. See our color scale above or read the complete guide.

How long does production take?

Every Brownstone piece is made to order in our NYC workshop. Production takes 2–3 weeks from order confirmation. We hold no inventory — your piece is made specifically for you in your size and metal. For rush orders contact us at 929-806-1502.

Can I return a Brownstone Collection piece?

14 days from receipt to return any piece. Made-to-order items that have been sized or customized are final sale. Contact us at info@blackpearlofqueens.com or call (929) 806-1502.

Is shipping free?

Yes — free shipping on all orders. Express upgrade available at checkout. All Brownstone pieces ship fully insured in our signature gift box with polishing cloth and care card.