Okay, so I asked a question here few days ago about any good/official cover/case for Lumia 730..Since no one came up with anything, so I decided to purchase a Nillkin Frosted Sheild back case from Flipkart. If you don't know yet, Nillkin is a reputed Chinese case/cover manufacturing brand and Windows Central have Nilkkin cases in their shops too (no L730 case yet)..The speaker hole is a bit off, but it doesn't cover any part of the speaker grill..You also get a Nillkin screen-guard for L730 in the box, but it's significantly smaller than the regular sized screenguards (No screen-guard for L730 can cover the whole screen, as it's a curved screen, but this Nillkin one is way too much smaller than Chevron or Karpine ones)..The screenguard applied on my phone is of a local brand which I can't remember, but it's the perfect size, Nillkin is smaller in width..The back cover is of matte finish but with coarse granules, so it is not slippery like the original Nokia back cover with matte finish, i.e, black, white and green ones..
Below I'm sharing some photos of it..If you plan to buy a Nillkin case for your Lumia 730, I have some suggestions about the colour choice: If your L730's back cover is White, go for Nillkin red coloured case; if black cover, then gold case; if green cover, then black case; if orange cover then brown case..well, they are just some suggestions of mine, coz these colours complement each other..I bought a black one since it was on sale..