Skip to Main content

Free Shipping on orders over $100 & 30 Days Free Returns

  1. Home
  2. / MM to Carat Weight Conversion

MM to Carat Weight Conversion

Select a shape to view it’s respective chart

Round Cut Millimeters [mm]to carat weight
Stone Size In Mm
Carat weight

Diamond Size Chart

This diamond size chart will help you compare sizes for our man made diamond and diamond simulant stone selection, as well as our lab grown diamond options. Here you can find the carat size and weight of all of our classic shapes.

Still don’t know how to tell the difference between diamond sizes? For further questions regarding our diamond carat size chart, our team of professional jewelers would be more than happy to help you pick out your dream lab diamond ring.

Know your stone choices when shopping for man made jewelry:

Understand the differences between man made diamonds and alternative stones to choose the perfect option for you engagement ring or fine diamond jewelry. At Diamond Nexus, all of our loose diamond simulants have the same sparkle and brilliance as mined diamonds, but are conflict-free, of perfect quality and a fraction of the cost. No matter what cut, size, shape, or weight you had in mind, we’re sure you’ll be able to find exactly what you’ve dreamed of through our online selection.

The Nexus Diamond™ Alternative

  • The world’s first heirloom-quality diamond simulant.
  • Flawless, colorless and Ideal Cut as graded by Forever Companies’ stringent code of ethics.
  • Simulates the look, feel and wear of diamonds.
SHOP NOW

Lab Grown Diamonds

  • Carbon diamonds, grown in a lab.
  • Graded and certified by the International Gemological Institute (IGI).
  • Conflict free.
SHOP NOW

Moissanite

  • Durable and highly refractive
  • Less susceptible to cracking and chipping
  • More fire and brilliance than a diamond
SHOP NOW

So you bought a loose stone. Now what?

wedding band

FOREVER ARTISANS

Fine Custom Jewelry Brought to Life

Work with a world-class jewelry designer.

  • Design a custom piece for your loose stone.
  • Start with an idea or have a designer help you through the process.

Have your loose stone set into an existing design.

  • Choose from hundreds of styles on DiamondNexus.com
  • Or show a designer a ring style you like from elsewhere and we can create something very similar.
Learn More