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’ 2017 Diamond Insight Report …

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 part of the Lelatema Mountains …

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 these finite resources can be …

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 and the uniqueness, grateful …

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 the MGMH collections, the …

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 is one of the …

When the Mounting Gets Rough

Rough-gem-set jewelry maintains its popularity among entry-level buyers and shrinking violets for its under-stated glam and one-of-a-kind effects.  Offer rough options to clients who have everything or their daughters with tighter budgets; you may be surprised at the response. Market …

Inhorgenta Munich Trade Fair 2017

The show featured six halls: Timepieces, Technology & Bijoux, Fine Jewelry, Elegance & Lifestyle, Carat and Contemporary Design, and Vision. The Inhorgenta Show was held February 18-21 at the Messe Munchen Fair Grounds (Munich) Germany. The main halls are connected …

Manufacturing Process Problematic?

A manufacturing process offered an unexpected surprise to a jeweler and it was not a pleasant surprise at all. This article is a warning that the outside of the jewelry may conceal something in the inside. A colleague recently sent …

The Burma Embargo

In 2008, the U.S. signed into law the “Tom Lantos Block Burmese Jade Act affecting both rubies and jade from being exported to the U.S. This past October, the ban was lifted. What were the effects of this ban over this long …

Connoisseurship: Grading Special Cases – Grading Pearls

Think of the beautiful glowing skin of a healthy baby or the dewy complexion of a beautiful young woman. These are excellent analogies because healthy skin has qualities similar to the skin of a pearl, and it is these qualities …

The Making of a Pearl—Natural Nacreous Pearl

“This prince possesses the most beautiful pearl in the world, not by reason of its size, for it only weighs 12 1/16 carats, nor on account of its perfect roundness; but because it is so clear and transparent that you can almost …

A Look at Emeralds

Emerald is the most prized variety of Beryl. The use of emeralds in jewelry and objects of personal adornment date back more than two millennia. Emerald occurrences are known from North and South America, Europe, the Middle East, Africa and …