Corundum Value, Price, and Jewelry Information
...Sapphire and ruby are prized jewelry stones. CORUNDUM: Sapphire, Sri Lanka (184, in gold pendant with diamonds). Photo © Joel E. Arem, PhD, FGA. Used with permission. Identifying Characteristics Natural:...
Scapolite Value, Price, and Jewelry Information
...Scapolite: Tanzania (32.44, 32.00). © Joel E. Arem, PhD, FGA. Used with permission. Comments The scapolite mineral group contains a solid state series from marialite to meionite, with mizzonite as...
Opal Value, Price, and Jewelry Information
...Australia (Stone in Bracelet ~ 20 carats). Photo © Joel E. Arem, PhD, FGA. Used with permission. Opal is an amorphous form of silica, chemically similar to quartz, but containing...
Smithsonite Value, Price, and Jewelry Information
...gems ~ 18, 12). Photo © Joel E. Arem, PhD, FGA. Used with permission. Identifying Characteristics Smithsonite effervesces in warm acids. Please keep in mind that acid testing is a...
What are Gem Species and Gem Varieties?
...gem species. Garnets, sapphires, and tourmalines also have color change varieties. Chrysoberyl: Alexandrite, Russia (~ 6). Green (daylight) and red (incandescent). © Joel E. Arem, PhD, FGA. Used with permission....
Fluorite Value, Price, and Jewelry Information
...New Hampshire (38.10). Photo © Joel E. Arem, PhD, FGA. Used with permission. Ontario, Canada: banded, violet material in calcite. Colombia: green. Huanzala, Peru: pink crystals. Chamonix, Switzerland; octahedral pink...
Labradorite Value, Price, and Jewelry Information
...(~ 14). Photo © Joel E. Arem, PhD, FGA. Used with permission. FELDSPAR: Labradorite – “sunstone,” Oregon, showing color range (~1 to 5). Photo © Joel E. Arem, PhD, FGA....
Gemology Reference Books: Reviews
...available through Amazon. Color Encyclopedia of Gemstones. Joel Arem, Ph.D., F.G.A. Springer, 2nd edition, 1987. 248 pp. If you like romantic stories highlighting the glamour of gems, this book isn’t...
Understanding Gem Synthetics, Treatments, And Imitations, Part 3: Synthetic Diamond
...a chapter from Dr. Joel Arem’s forthcoming book, Gems and Jewelry, 3rd Edition. © Joel E. Arem 2011-2013. The International Gem Society (IGS) gratefully thanks Dr. Arem for his contributions...
Understanding Gem Synthetics, Treatments, And Imitations, Part 5: Identifying Gemstone Treatments
...Joel E. Arem 2011-2013. The International Gem Society (IGS) gratefully thanks Dr. Arem for his contributions to the field of gemology and for allowing us to reproduce this chapter. Characteristics...
