Audio Grade Ethernet Cable

To the original question… Audio Grade Ethernet Cable

In my opinion there is no such thing. Yes Cat6a is the better choice. However all the cable is doing is acting as a transmission line for electronic data. 
Look for audio grade RAM because that is to where the data is being buffered prior to streaming.

Good luck.

@jetter From $1,000.00 to $10,000.00 is a huge mark but it may be realistic. 

What about a fiber conversion kit?

https://www.amazon.com/gp/product/B09P4ZS4QN/ref=ox_sc_saved_title_1?smid=AK4611NBN3D7D&th=1

@goofyfoot 

From $1,000.00 to $10,000.00 is a huge mark but it may be realistic.

Pardon me as I did exaggerate.  Have no real experience with actual audio mark ups but have read here that 5 times cost from manufacture to sale is not unusual.

@goofyfoot 

I too bought into using Cat 8 cable and found it made no noticeable difference with anything.  I used to watch OCD Mikey and Jay’s Audio Lab and both of the said to make your eithernet cable the last thing you replace.  Mikey never really gave a good reason, but Jay said that the eithernet cable made the least amount of difference in sound quality of anything in his system.

All the best.