Identifying an old European cut diamond may seem simple but there is a set of GIA standards that determine from their perspective whether it is or is not. This set of standards is not widely…
Featured ArticlesINTRODUCTION Diaspore is a mineral species with the formula, AlO(OH). It was first discovered in Sverdlovsk Oblast, Russia (the type locality) in 1801. Since the initial discovery, diaspore has been found in numerous localities around the…
Featured ArticlesOne evening last January, I just couldn’t get to sleep. As I lay in bed wondering what I could do to pass the time, it struck me, “I will look for gemstones on eBay.” Little…
Featured ArticlesA common question among valuers is how to value items purchased in different markets. Many factors influence the price, cost, and value. Another consideration is the use of price guides and how the international markets…
Featured ArticlesBranding provides individuality to a gem beyond its beauty, rarity and durability. Its purpose is to add value to the subject material. However, when done loosely, it can result in a misleading interpretation of a…
Featured ArticlesTucson sets expectations for 2019. Good demand for an array of colored stones. Two industries, one new and one old. Sapphires are king but everyone loves garnets. The emeralds of Ethiopia surprisingly scarce. Emerald disclosure or blunder? The…
Colored Stone MarketPearls are a vast subject worthy of years of study. There are nacreous and non-nacreous pearls, each with subcategories of varieties. Prices, colors, qualities, sizes are seemingly endless and it takes great effort to learn about all…
Featured ArticlesIn recent years following the continued popularity of tanzanite, fancy colors of zoisite have been increasing in demand. Pink, green, orange, and even brownish yellow colors are being sought after. Prices are rising not only…
Featured ArticlesThis is the fourth article in a series by the author for the GemGuide on natural vs. enhanced gems. The first article covered fancy compressed blocks comprised of natural gemstone ingredients, metals, shells and resins…
Featured ArticlesGEUDA SAPPHIRE: THE PAST, PRESENT, AND FUTURE OF A TRANSFORMATIVE GEMSTONE Despite humble beginnings, geuda sapphire revolutionized the jewelry industry through its transformation from insignificant rock to dazzling gem. A simple invention led to an entirely new…
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