Diamonds and Lab-Grown Diamonds

Exceptional Brilliance. Endless Possibilities. 

At Coin Galleries of Oyster Bay, we believe every diamond tells a story — one of love, celebration, and lasting beauty. Whether you’re drawn to the timeless allure of a natural diamond or the modern innovation of a lab-grown diamond, we offer a collection that delivers brilliance, quality, and value. Come visit us in Oyster Bay or Lynbrook.

Natural Diamonds 

Our natural diamonds are carefully selected for their sparkle, purity, and authenticity. Formed deep within the Earth over billions of years, each diamond is a one-of-a-kind masterpiece of nature. We offer a wide range of diamond shapes and settings to suit every taste — from round, oval, and emerald cuts to cushion and pear shapes. Every diamond is GIA-certified, ethically sourced, and graded for excellence in cut, color, clarity, and carat weight.

Lab-Grown Diamonds 

For those seeking a sustainable and affordable alternative, our lab-grown diamonds offer the same stunning brilliance and chemical composition as natural diamonds — just created in a modern laboratory environment.

Lab-grown diamonds are 100% real diamonds, identical in appearance and quality, yet often cost up to 40% less than mined stones. They’re an ideal choice for eco-conscious shoppers who want exceptional beauty without compromise.

Compare the Two

Your Diamond, Your Choice 

Whether you choose a natural or lab-grown diamond, our expert team will help you understand the “Four Cs” — cut, color, clarity, and carat — so you can select the perfect stone for your ring, necklace, or custom design.

Visit Us 

Experience the sparkle in person at our Oyster Bay or Lynbrook showroom. Explore loose diamonds, finished pieces, and custom settings designed to showcase your diamond at its best.