Acetone is great for removing oil stain on Quartzite. Soak the area a couple times over a day or so with acetone and wipe up after a couple minutes to help remove any sealer that was applied. Then soak a shop rag paper towel with acetone and apply it over the stain. You have to really soak it. Then cover it in plastic and tape it down. I like to use 3m painters tape. Not green or blue tape. Poke a few holes in it. Leave that sit for at least 24 hour. You can check it. If the rag is still damp recover it and let it sit till it is dry. Now here is the scary part for people. The stain will look horrible and much darker then the surrounding stone. That is because the acetone soaked into the stone. That is what you wanted it to do to break up the stain. Sit and wait. It will dry. Sometimes very quickly. A day or so. Sometime it will take a week or even longer. Let it dry till either the stone returns to its color or the stone returns to its color and the stain is still there. Sometimes it takes several attempts to remove this. Its sometimes is a long process. Then yes you have to seal the spot that was affected with the acetone. I work for a fabricator and I remove stains on all types of stones. All stones are able to be stained, even with the best sealers. I know we have used them all. Sealers are to only help staining from penetrating. Anything and everything will still penetrate stone. Even the unstainable quartz stone so they say. Stonetech oil stain remover is a great stain remover. Sometimes it will leave a haze after you attempt to remove a stain and it dry's out. KEY let it completely dry. It takes time and you have give it time to dry. If it has a haze. Remove it with a acetone rag like my notes above. Do not use acid base anything on any countertops as a cleaner or stain remover. It will etch your stone. Also no acetone on any quartz countertop. I have removed almost any stain on quartz with softscrub with bleach. The green bottle sold everywhere. Shake well. Apply the softscrub. Add a little bit of water and lightly scrub with a little force. If you go crazy and scrub hard for a bit you can mar or dull the finish on the stone. That would be bad because it very very hard to fix. Repeat if needed to remove the stain. Only use acetone on natural stones. Stains need patients. I have only ran into a few permanent stains in my 13 years in this industry. Sorry for the long post.

Try dripping a few droplets of water in the same area. If the water beads up (i.e., doesn't absorb into the stone and leave dark/shadowy spots), it's likely the ring is an oil stain -- which means your contractor likely didn't use a sealer that protects against both water- and oil-based liquids. Any idea what brand he used? Also, what type quartzite do you have? Close-up looks similar to my Calacatta Gold.

I am a fabricator. I agree, let the fabricator deal with it. The locationindicates it's NOT due to layout tape. The tape is used to outline the piece to be cut so it doesn't make sense that the line you see is from the fabricators tape layout. Also doesn't look like sun fading from a metal strap as that would extend across the full slab. Good luck.

A little too long. After months and months of dealing with this, I have noticed that the stains are less noticeable (and eventually fade away) than the actual poltice drying process. However, I do lay a kitchen towel down on my counter when I’m cooking with oil