Silestone is not granite. It’s what is called ”quartz”, which is ground up quartz particles mixed with plastic resins. Many of them, like the two you’ve shown, try to imitate marble, but never look like the real thing. What you have on your counters are real stone, those two examples are not.

Neither of those two slabs compliment your quartzite counter.

I'm sorry, you are correct. I meant to write quartz, not granite. But I wanted something more durable than marble or granite, that would be good for the heavy use of a kitchen table and not worry about things like water ring marks and such.

Well, if you must have plastic for a dining table, pick a color from your counter, a solid color, and go with that. Just be careful about putting dishes straight from the microwave on it. Estone (aka, quartz), can melt and burn from heat. It can also suffer from thermal shock, and crack. Use trivets.

You have a LOT of pattern going on in the kitchen already. How about a traditional wood kitchen table and wood chairs with no fabric?

And yes, use trivets and placemats.

I have 15 year old quartz and have always put things from the microwave on it, the stove, no.

Neither of your selections work with the existing space and colors. Look at the counter and select pull a color out for the quartz that is solid.