Moissanite Size Guide Millimeters to Diamond Carat Weight

Have you ever found yourself confused by the various measurements in moissanite size charts? The mix of millimeters and carats can be perplexing for first-time buyers. This guide will clarify all your questions about moissanite dimensions, helping you make informed purchasing decisions.

Moissanite, also known as silicon carbide, is a lab-created gemstone that has gained popularity as an ethical and budget-friendly diamond alternative. With its exceptional brilliance, high refractive index, and remarkable durability (9.25 on the Mohs scale), moissanite offers visual characteristics nearly indistinguishable from diamonds at a fraction of the cost.

When shopping for moissanite, you'll encounter two primary measurement systems: millimeters (mm) for physical dimensions and carats (ct) for weight. Since moissanite has a slightly lower density than diamonds (3.21 g/cm³ vs. 3.52 g/cm³), a moissanite stone will weigh about 15% less than a diamond of the same size. This makes conversion charts essential for comparing moissanite to diamond equivalents.

Below are detailed conversion tables for various moissanite cuts, allowing you to understand how moissanite measurements correspond to diamond carat weights:

1. Identify the cut: Determine which shape (round, oval, princess, etc.) matches your moissanite.
2. Measure dimensions: Use calipers to measure the stone's diameter (for round cuts) or length x width (for fancy shapes).
3. Find equivalent weight: Locate the closest measurement in the appropriate chart to see the diamond carat equivalent.

• Color: Graded from D (colorless) to K (faint yellow)
• Clarity: Evaluates internal and surface characteristics
• Cut: Precision of faceting affects brilliance and fire
• Certification: Documentation from reputable gemological labs

• Establish your budget before comparing options
• Understand the 4Cs (color, clarity, cut, and carat weight)
• Request certification for quality verification
• Examine stones in different lighting conditions

With this comprehensive guide to moissanite sizes and measurements, you're now equipped to navigate the world of diamond alternatives with confidence. Whether you're selecting an engagement ring or special jewelry piece, understanding these conversions ensures you'll find the perfect balance of size, quality, and value.