This was gonna be a question that while asking I had an aha! moment.
So now this is a tutorial.

You'll need 2 identical vases to make 1 color vase.
Superimpose both at the exact same place.

Set vase 1 materials as such:
Shader Type: Traditional
Displacement: Image file 100% black, strength = -50 (Maybe a stronger negative amount might be needed if it glitches)
Material settings: Set your color saturation double of what you want to see.
Opacity: 50%
Reflection Checked 100%

Set vase 2 materials as such:
Shader Type: Traditional
Material settings: Color here has no effect.
Opacity: 50%
Refraction Checked 25%

One color glass vase.
The first one is the color tint and clear coat shine.
The other is the glass effect only.

That looks very good! Thanks for this.

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Creative and brilliant solution.
Thanks for sharing it with us.

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iClone 7... Character Creator... Substance Designer/Painter... Blender... Audacity...
Desktop (homebuilt) - Windows 10, Ryzen 9 3900x CPU, GTX 1080 GPU (8GB), 32GB RAM, Asus X570 Pro motherboard, 2TB SSD, terabytes of disk space, dual  monitors.
Laptop - Windows 10, MSI GS63VR STEALTH-252, 16GB RAM, GTX 1060 (6GB), 256GB SSD and 1TB HDD

Sorry for the confusion but that image is what I wanted to accomplish not the end result.
Faking it in iClone is close to this but not exactly.

OK...

What I have done in the past with glass is adding some self-illumination. This also work well for liquids in the glass. You could try adding that to your mix.

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At first I did add self illumination but that wasn't convenient for variable lighting setting self illumination would need to be constantly adjusted to look either bright enough or not look like it's emitting light.

Interesting...


Could you post a picture of your result in iClone?



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This is why I wanted color glass for my nannybot Violet.