Category: Featured Articles

Emeralds from Ethiopia

Emeralds are a welcome business for Ethiopia. The recently discovered gemstone deposits in Ethiopia contribute to the utterly needed economic growth of this East African nation.   A few years ago, during an interview on international TV, a…

Collecting Engraved Gems

This text gives an overview of the characteristics associated with engraved gems, presented from the perspective of a collector. Furthermore, it demonstrates that gem collectors have always existed and enjoyed a variation of gems based on…

Reigniting Diamond Desire

Depressed demand for jewelry is hurting everyone—from miners to retailers—in the supply chain. The GemGuide talked to industry leaders to explore opportunities for change and learn how to reignite consumer passion for our product. De Beers…

The Rarity of Tanzanite

In 1967, blue-violet crystals of the mineral species, zoisite, were discovered south of Mount Kilimanjaro in northeast Tanzania. The host rocks of the discovery, which are orders of magnitude older than Africa’s highest mountain, form…

The Gem Trade of Tanzania

Tanzania is host to a vibrant gem trade. The country, like its East African neighbors, is rich with mineral deposits, many of which are relatively recent discoveries. For miners and traders, the wealth inherent in…

Enhanced Lapidary Materials

FANCY COMPRESSED BLOCKS: THE LATEST TREND We all love using natural untreated gem materials for our lapidary projects and jewelry artwork. We like the organic feel, the symphony of colors, the diversity of textures, the quality…

The Hamlin Necklace

The Hamlin Necklace is a treasure of the Mineralogical and Geological Museum at Harvard University (MGMH) that was designed and commissioned by Augustus Choate Hamlin in the late nineteenth century. (See cover photo.) Apreeminent piece in…

Handheld Spectroscopy

The spectroscope is a very useful gemological instrument that is underutilized by gemologists worldwide. Learning to master this tool will greatly help in practical gem testing and identification. CORRECT METHODS AND APPROACH IN GEM TESTING Spectroscopy…