Lesson 3: Ten Gemstones Rarer than Diamond

In reality, there are many gemstones rarer than diamond. However, few people know what those gems are. If you’re looking for something unique for your next jewelry purchase, check out these ten stunning gemstones that you wouldn’t have guessed are rarer than diamonds.


Intense violet-blue hues of tanzanite can rival fine sapphire at a fraction of the price – and it’s a much rarer stone! Occurring only in a small area of Tanzania, this variety of zoisite has become quite prominent. After its discovery in 1967, it quickly rose in popularity, due in part to marketing efforts by Tiffany & Co. This stone shows strong pleochroism, appearing blue, violet, or green-yellow to brown, depending on the viewing angle.  Gem cutters orient these gems to feature blue or violet hues. Though almost all tanzanite undergoes heat treatment to produce its attractive blue hues, this treatment produces a stable …

Unearth The Secrets Behind The Beauty

Introducing "Discover Gemology" by IGS, the premiere introductory training for those fascinated by the magnificent world of gemology.

  • How to spot the most unique & valuable characteristics of different gemstones
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Course: Discover Gemology: Fundamentals, Tools & Meanings
Purchase Course: $49
Skill Level: beginnner
Lessons: 48
Time: 480 min