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Characterization and identification of gems by the use of color filters has always been an appealing approach because of its affordable simplicity and the ease of examining multiple specimens.
For those who want the entire body of Dr. Hanneman's life work on Gem Filters - a tremendous value!
Using these filters is simple. Just place the stone on the included viewing surface, illuminate it with incandescent light, and hold the filter close to the eye. Observe the apparent color of the stone and match that up with the identifying chart that comes with the filter.
Please note: Actual set contains about 50 "luggage tag" cards.
This item typically ships within 1 business day.
Great tools, looking forward to making use of them in my upcoming course. Albert Tully on Oct 21st 2019