A damaged Tahitian cultured pearl that was presented for identification is a good example for demonstrating the importance of nacre thickness as an evaluation factor for Cultured Pearls. The Single Pearl had been bought a year…
Gem Market NewsIn January, the trade and consumer press picked up on an item for sale of huge size and supposed value. The emerald weighed in at 57,500 carats and was appraised for $1.15 million. The emerald…
Gem Market NewsAlthough oiling of emeralds has been done since ancient times, modern forms of resins came under question in the 1990s. Although irradiation attempts were made with emeralds two decades ago, no commercial production appeared. Recently…
Gem Market NewsSpinel was always thought to be a gem that did not respond to heat treatments. Now, some research shows that some spinels may in fact respond to treatment. The Treatment of Spinel, is a topic I…
Gem Market NewsOpal is an intriguing gemstone since mineralogically it is considered to be a common silica gel. However, in certain locations, it occurs in its precious form displaying play-of-color due to more regular internal structure compared…
Gem Market NewsWith slow markets, diamond prices were expected to drop but so far only minimal corrections have been seen. Buyers globally remain cautious. Mining companies produce fewer diamonds and BHP considers selling its Ekati diamond mine…
Diamond MarketIn Tucson, an appraisal forum was held, developed and sponsored by the California Institute of Jewelry Training and Master Valuer International. The concept was to invite a panel of appraisal experts to discuss appraisal issues…
News ArchiveFor centuries the ruby deposits of Burma (Myanmar) have been particularly important to supplying the trade with rubies, and as such have essentially set the standard by which both price and quality of all rubies…
Gem Market NewsGold hit a record price of about $1,920 per ounce on global markets this past September. High gold prices have been the norm since they exceeded $1,000 per ounce in March 2008. How has this…
Gem Market NewsGemworld received this yellow stone for identification from a jeweler. Our first instinct was that the greenish yellow color was "unnatural." However, this color is rare but possible in nature and as always, full gemological…
Gem Notes