Creating the Perfect Ring When You Already Have a Diamond

Maybe it’s a family heirloom. Maybe it’s a diamond you purchased a while ago. Or maybe your partner already has the stone they’ve always dreamed of. Whatever the story, you’ve got the diamond—but now you need the ring.

At Koser Jewelers in Lancaster, PA, we meet quite a few people in this exact situation. While most of our guests are shopping for both a center diamond and a setting, we’re always happy to help if you already have the stone. Whether you want to design a custom ring with your diamond or choose a pre-made setting that fits, we’ll guide you through the process with clarity and care.

Here’s what to know if you’re designing an engagement ring using your own diamond.

Start With the Diamond You Have

If you’re bringing in a diamond that wasn’t purchased from us, we’ll begin by inspecting it. We check for chips, confirm its measurements, and make sure it will be secure in the new setting. These small steps help us protect your stone and guide you to the best design.

If you have a GIA, AGS, or other diamond certificate, bring it along—it can help us even more as we look at your ring options.

Explore Ring Settings That Fit Your Diamond

Once we’ve looked at your diamond, we’ll talk about setting styles. Are you envisioning something classic and timeless? Something bold and modern? A halo design or a sleek solitaire?

You can browse our in-stock settings, or we can help you design a custom ring with your diamond as the centerpiece. Some ring settings are flexible and can hold a variety of diamond shapes and sizes. Others may need adjustments to fit your stone precisely. No matter what, we’ll walk you through the best options—at your pace.

Custom Engagement Rings Using Your Diamond

If you want something completely one-of-a-kind, our team can help you create a custom engagement ring using your diamond. You’ll work directly with our experienced team—including one of our in-house goldsmiths who specializes in custom design.

Depending on your project, we might use hand-drawn sketches, wax models, or CAD (computer-aided design) images to help you visualize the ring. We’ll choose the method that works best for your style, budget, and timeline. You’ll be part of every step and have the opportunity to make adjustments along the way.

It’s a collaborative, creative process—and one we’ve guided many Lancaster couples through over the years.

It’s Not Just for Engagement Rings

While we often help people design engagement rings using their own diamond, we also create necklaces, right-hand rings, or anniversary pieces with guest-supplied stones. If you’ve been holding onto a loose diamond or a piece of jewelry you’re ready to redesign, we’d love to help you reimagine it into something you’ll wear every day.

Work With a Trusted Lancaster PA Jeweler

Whether you're using our expert guidance to choose the perfect diamond or bringing in a stone you already own, we're here to help you create the ring of your dreams. From exploring settings to designing something custom, we’ll guide you through every step with care and clarity.

Visit our Mount Joy showroom or make an appointment online today. We’d be honored to be part of your story.