Journal

IGI diamond grading certificate for a lab-grown diamond, showing report header, 4Cs grades, measurements, clarity plot, and verification details — a complete technical record of a graded stone.
What's on an IGI Diamond Certificate (and How to Actually Read One)
A complete walkthrough of an IGI diamond grading certificate — what every section means, how to read the 4Cs and clarity plot, how IGI compares to GIA, and how to... Read more...
Cognac diamond pavé engagement ring in 14K brown gold from the Brownstone Collection
The Brownstone Collection: What It Is and Why I Made It
The story behind the Brownstone Collection — why natural cognac and champagne diamonds, why brown gold, and what the line covers. Handmade to order in Woodside, Queens by Dimitrios Koukoulis. Read more...
Cushion-cut Lab-Grown Diamond bezel engagement ring in 14K yellow gold
Antique Cushion-Cut Engagement Rings: A Bench Jeweler's Guide to the Vintage Revival
A New York bench jeweler explains the antique cushion-cut revival — how old cuts differ, why they're back, and how to get the vintage look made to order. Read more...
Cognac diamond pavé cluster band in 14K brown gold — demonstrating the design pairing of natural cognac diamond with brown gold alloy that defines the Brownstone Collection.
Why We Set Cognac Diamonds in Brown Gold (And No One Else Does)
The case for pairing natural cognac diamonds with 14K brown gold — the color theory behind the combination, what every other metal does to a cognac stone, and why almost... Read more...
Side-by-side comparison of natural and lab-grown diamonds in fine jewelry settings — illustrating that both are real diamonds with identical chemical and optical properties.
Natural vs Lab-Grown Diamonds: An Honest Comparison from a Working Jeweler
A jeweler who works with both stones compares natural and lab-grown diamonds honestly — how each is made, what's identical, where they really differ, current pricing, and how to choose... Read more...
Cognac and champagne diamond rings shown side by side, demonstrating the visual difference between the two natural fancy-color diamond types used in the Brownstone Collection at Black Pearl of Queens.
Cognac Diamonds vs Champagne Diamonds: A Jeweler's Side-by-Side Guide
Cognac and champagne diamonds aren't the same stone. A jeweler's side-by-side comparison of color, rarity, pricing, and how to choose between them — with real photographs of both stones in... Read more...
Interior view of the Black Pearl of Queens jewelry workshop in Woodside, Queens — where every ring is made by hand from raw casting to final polish.
How a Ring Is Made: A Step-by-Step Walk Through Our Woodside Workshop
A step-by-step walkthrough of how a fine jewelry ring is actually made — wax model, lost-wax casting, filing, stone setting, polishing, inspection — told by the jeweler doing the work... Read more...
Five identical cognac diamond solitaire rings shown side by side in 14K brown gold, yellow gold, rose gold, white gold, and platinum on a dark slate background — demonstrating the visual difference of brown gold from other precious metals.
What Is 14K Brown Gold? The Alloy We Made for the Brownstone Collection
14K brown gold is a copper-forward solid gold alloy we developed in our Woodside workshop to set natural cognac and champagne diamonds. A complete guide to what it is, how... Read more...
Princess cut engagement ring blog news
Princess Cut Engagement Rings: Why the Square Diamond Is Having Its Moment in 2026
Princess cut engagement rings are surging in 2026. Here's everything you need to know about the square diamond — settings, sizing, gold options, and why lab-grown makes it the smartest... Read more...
Behind the Scenes in NYC: Crafting the Perfect Cursive Initial Ring
Behind the Scenes in NYC: Crafting the Perfect Cursive Initial Ring
Step inside the NYC workshop to see how a cursive initial signet ring is designed, cast, polished, and engraved by hand. Real craftsmanship, not mass production. Read more...
Diamond Stud Earrings: The Ultimate Buying Guide for 2026
Diamond Stud Earrings: The Ultimate Buying Guide for 2026
The complete guide to choosing diamond stud earrings — settings, gemstones, gold colors, and the best studs handcrafted in solid 14K gold in NYC. Read more...
Diamond pendant necklaces in 14K gold from the Amora Collection by Black Pearl of Queens
Diamond Pendant Necklaces: How to Choose the Perfect One for Her
Bezel, pavé, drop, bar, or script — a complete guide to choosing the perfect diamond pendant necklace, featuring every piece in the Amora Collection by Black Pearl of Queens. Read more...