Collector's Corner

Natural colored gemstones demonstrating weak, moderate, strong and vivid color saturation and how saturation affects gemstone quality and value.
Understanding Gemstone Tone: Why Lightness and Darkness Matter in Natural Gemstones
Learn how gemstone tone describes the lightness or darkness of color, why overly light or dark stones can perform differently, and how tone influences beauty, brilliance and quality. Read more...
Understanding Gemstone Hue: How Primary and Secondary Colors Affect Gemstone Quality
Understanding Gemstone Hue: How Primary and Secondary Colors Affect Gemstone Quality
Learn how gemstone hue defines primary and secondary color, how color modifiers affect natural gemstones, and why hue matters when evaluating sapphire, tourmaline, spinel and other colored gemstones. Read more...
June Collective sapphire buying guide featuring blue, pink, yellow, green and purple sapphires with tips on 15 common sapphire buying mistakes.
15 Common Mistakes People Make When Buying Sapphire
Avoid common sapphire buying mistakes and learn how to evaluate natural sapphire color, tone, clarity, cut, treatments, certification, dimensions, origin and value before you buy.   Read more...
Tourmaline Color Guide: Colors, Rarity, Value & Varieties
Tourmaline Color Guide: Colors, Rarity, Value & Varieties
JUNE COLLECTIVE GEMSTONE GUIDE Explore the extraordinary spectrum of natural tourmaline, from delicate pink and vivid rubellite to rich green, indicolite blue, teal, watermelon, bi-color and exceptional copper-bearing varieties. SHOP... Read more...
15 Common Mistakes People Make When Buying Tourmaline
15 Common Mistakes People Make When Buying Tourmaline
Avoid costly mistakes when buying natural tourmaline. Learn how to evaluate color, tone, clarity, cutting, treatments, dimensions, lighting and value before choosing a loose gemstone. Read more...