Yes. Looking in posted IOR values on the Internet, both ruby and sapphire are reported to be 1.76. Glass is typically 1.54 to 1.65.

There is a danger in trusting Internet postings on IOR. I went looking for confirmation of car paint IOR values, and found a guy who blatantly plagiarized what I had said, which means he had no clue any more than I did. grin

If you want to see this amusing punk who literally stole my explanation of IOR, google this exact phrase:

"particular rate and degree that reflections increase with decreasing angle of incidence"

Google will return my car paint shader page,

https://sites.google.com/site/bagginsbill/free-stuff/car-paint

and this blog called bohemiantruckstop.

http://bohemiantruckstop.blogspot.com/2010_11_01_archive.html

I wrote:

PM:IOR - The "index of refraction" controls the particular rate and degree that reflections increase with decreasing angle of incidence. While there is no actual "refraction" happening in this shader, the concept of IOR is commonly used to specify the parameter needed control the Fresnel effect in a realistic way. (The glossy "clear coat" layer on top of car paint actually is refractive, and the index of refraction controls the reflectivity as well.) The IOR of water is 1.33. The IOR of glass is typically around 1.54. The default value of IOR in the car paint is 1.45. Decreasing the IOR will make the surface less shiny. Do not decrease it below 1. Increasing the IOR significantly past 2 will make the surface appear more metallic. Since the "clear coat" layer on car paint is not a metal, you shouldn't go much past 2 for realism. (In real life, certain extremely expensive paint jobs can get the IOR up to 2.)

He wrote:

IOR - The "index of refraction" controls the particular rate and degree that reflections increase with decreasing angle of incidence. The concept of IOR is commonly used to specify the parameter needed control the Fresnel effect in a realistic way. (The glossy "clear coat" layer on top of car paint actually is refractive, and the index of refraction controls the reflectivity as well.) The IOR of water is 1.33. The IOR of glass is typically around 1.54. The default value of IOR in car paint is 1.45. Decreasing the IOR will make the surface less shiny. Do not decrease it below 1. Increasing the IOR significantly past 2 will make the surface appear more metallic. Since the "clear coat" layer on car paint is not a metal, you shouldn't go much past 2 for realism. (In real life, certain extremely expensive paint jobs can get the IOR up to 2.)

The date of his blog post is November 7, 2010. The date of my page was last edited is July 13, 2010, but I wrote that description on June 8.

Notice how he had to edit to remove where I mention "this shader" - but that's all he did. Stupid punk. He even left my grammar errors.

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Renderosity forum reply notifications are wonky. If I read a follow-up in a thread, but I don't myself reply, then notifications no longer happen AT ALL on that thread. So if I seem to be ignoring a question, that's why. (Updated September 23, 2019)