Hi,  Go for Jet black granite for counter top. It would look classy with your white ceramic wash basin and beige wall tiles. And go for above counter wash basin.

Thanks. I am aware of potential materials (e.g. quartz). I was looking more at what color combination works well with ash oak cabinet colors? Would a softer tone mimicking wooden countertop (e.g. brown/beige colors) work better or would a darker tone such as black/dark brown go well?

There are several companies such as AGL, Johnson, Baba, Kalinga etc that makes engineered quartz in India. The choices of colors they offer also quite extensive. The prices of these quartz are not that much higher than good quality granite. So visit one of these showrooms to get a touch and feel of these materials.

Hey, IKEA has some great choices in solid surface kitchen countertops. Since you are trying to choose the best material for your kitchen countertops, you can head over to the IKEA website to get help with your decision. There, you can browse the different kitchen countertop options available and compare them. Besides their ready-made countertops, you can also get customised ones, so that they can suit your requirements better.