Sapphire Grading

Sapphire Grading Overview
General introduction and key concepts of sapphire grading
Sapphire Grading Types
Common types and categories of sapphire grading
Sapphire Grading Best Practices
Recommended approaches and guidelines for sapphire grading
Sapphire Grading Common Mistakes
Frequent errors to avoid with sapphire grading
Sapphire Grading Quick Reference
Essential values and measurements for sapphire grading
Sapphire Grading Comparison
Compare different options and variations of sapphire grading
Sapphire Grading Standards
Industry standards and specifications for sapphire grading
Sapphire Grading Safety
Safety considerations and precautions for sapphire grading
Sapphire Grading Tools Required
Equipment and tools needed for sapphire grading
Sapphire Grading FAQ
Frequently asked questions about sapphire grading
Share:

About Sapphire Grade

What this tool does

Jewelry tools convert between carats, grams, and millimeters, determine ring sizes across international standards, calculate gold purity (karat to fineness), evaluate the 4Cs of diamonds, and estimate metal density for casting.

Why use this tool

Jewelers and buyers need precise conversions. Knowing the exact gram weight of a 1.5-carat diamond, or the gold content in 18K vs. 14K, informs pricing and design decisions. These tools provide instant, accurate answers.

How it works

Carat-to-gram conversion uses the fixed ratio 1 ct = 0.2 g. Ring-size conversion maps circumference in mm to lettered or numbered systems (US, UK, EU, JP). Gold karat to fineness divides by 24 (18K = 75% gold).

Pro tip

Ring size varies with temperature and time of day. For the most accurate measurement, size the finger in the afternoon when hands are warmest and slightly swollen, not first thing in the morning.

Explore More

Love this tool? Explore 5050+ more

Free online tools for images, PDFs, text, code, and more. All running in your browser.

Explore All Tools