Comparison Chart of US Currency Coins and mm Size

About Us

Overall Rating -> 10

I was able to find what I wanted very easily!

Posted By Lenny in January, 2026

Source: Bizrate

Overall Rating -> 10

It was great! Great photos

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Great! Affordable

Posted By Spinellope in April, 2026

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Good, hope gem quality is good and genuine

Posted By Varun in May, 2026

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Overall Rating -> 9

Fast and reliable service.

Posted By Zæck in December, 2025

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Overall Rating -> 10

Always get a nice gemstone. Just like the picture. Never disappointed

Posted By Ron T in June, 2026

Source: Bizrate

Carat Weight

Gemstone Carat Weight - Gemstone Information - GemSelect

Gemstone Clarity and Cut

Clarity and Cut - Gemstone Information - GemSelect

August 2007 Newsletter: The Science of Gemology

Gemology and Gemstone Properties Testing, Featured Stone

Gemstone Shape vs Cut

Gemstone Shape and Cut - What is the difference?

Carats and Karats

Buying Gems in Thailand

Gemstone Price Per Carat

Gemstone Value: Price Per Carat for Precious Gems & Jewelry

How Big is That Gem?

Gem Buyer's Guide Advice

Buying Loose Gemstones: Buyers Guide to Online Gem Shopping

Gem Size to Weight Ratio

Gemstone Size to Weight Ratio