Pearl Size Guide: What Do Those Millimeters Mean?

When shopping for pearl jewelry, you’ll often see sizes like 6mm, 9mm, or even 13mm listed in the descriptions. But what do those measurements actually mean, and how do they affect the look and value of your pearls? In this guide, we break down everything you need to know about pearl sizes and how to choose the right one for your style.

How Pearl Size Is Measured

Pearl size is measured in millimeters (mm) across the pearl's diameter—essentially the distance from one side to the other at its widest point. This applies to all types of pearls, whether round or baroque. A difference of just 1–2mm can make a noticeable impact on the overall look of a pearl piece.

Pearl Size Comparison Chart

Here’s a general size reference for round pearls:

• 4–6mm: Dainty and delicate, ideal for minimalist earrings or layered bracelets.
• 7–8mm: Classic and versatile—perfect for everyday pearl necklaces or studs.
• 9–10mm: More substantial and elegant, often seen in luxury strands and bridal jewelry.
• 11–13mm: Bold and glamorous—ideal for statement pieces and special occasions.
• 14mm+: Rare and highly valuable, especially in South Sea or fireball pearls. Great for heirloom jewelry.

How Size Affects Style

Choosing the right pearl size can dramatically affect your overall look:

• Smaller pearls (4–7mm) offer a subtle, youthful charm and layer beautifully with chains.
• Mid-sized pearls (7–9mm) are timeless and refined—suitable for both casual and formal wear.
• Larger pearls (10mm+) make a bold, sophisticated statement and often draw attention as centerpiece jewels.

Does Size Impact Value?

Yes, all other factors being equal, larger pearls are rarer and generally more valuable. However, value also depends on luster, shape, surface quality, type, and origin. A smaller pearl with exceptional quality can be worth more than a larger pearl with flaws.

How to Choose Your Ideal Size

Consider your personal style, occasion, and body proportions. Petite individuals may prefer 6–8mm pearls for balance, while taller figures can carry 10mm+ styles effortlessly. For bridal wear or gifts, 7–9mm pearls are universally flattering and elegant.

Visualizing the Difference

It can be hard to gauge pearl sizes online, so we recommend checking visual comparison guides or contacting us for size references. You can also order custom-length strands or mixed-size designs that suit your taste.

Explore Pearls by Size

At Northwest Pearl Design, we offer handcrafted jewelry in a full spectrum of pearl sizes—from petite to oversized. Whether you prefer delicate accents or bold statements, you’ll find your perfect fit in our collections.

Frequently Asked Questions