Joined: Sat May 21, 2011 7:09 am Posts: 77 Location: Italy
Hi, I have one like your (red filter).
I post here my experience.
1) put the ruby on a black surface (if faceted, table down); 2) spot the gem with a led white light (reflected light); 3) observe the ruby from about 30 cm distance, using the filter as a lens (near the eye).
Result: the ruby bright red: other red gemstones, like garnets or spinels, become dark (black). Ruby filter is a easy way the separate ruby from other gemstones in a gem lot.
I find also that this ruby filter is a band pass filter for the band 680-730 nm (red region) of the visible light: it was tested with an incandescent lamp and my spectroscope.
1) put the ruby on a black surface (if faceted, table down); 2) spot the gem with a led white light (reflected light); 3) observe the ruby from about 30 cm distance, using the filter as a lens (near the eye).
Result: the ruby bright red: other red gemstones, like garnets or spinels, become dark (black). Ruby filter is a easy way the separate ruby from other gemstones in a gem lot.
I find also that this ruby filter is a band pass filter for the band 680-730 nm (red region) of the visible light: it was tested with an incandescent lamp and my spectroscope.
Result: the ruby bright red: other red gemstones, like garnets or spinels, become dark (black). Ruby filter is a easy way the separate ruby from other gemstones in a gem lot. I
I have a lot glass imitations of ruby. They give the same reaction under the filter.
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