Gresso has launched its iPhone 4 casing made of 200-years old African Blackwood, the signature material which they have used for the iPhone 3GS casing as well.

The Gresso iPhone 4 Black Diamond casing has an 18-K gold Apple logo embedded on the backside with an inlaid glittering black diamond.

This luxury case not only makes the device look pretty but also solves the ‘death grip’ problem that many users are facing, according to Gresso.

Stuart Hughes, the maker of frightfully expensive diamond-encrusted mobile phones and iPads, has come up with an option for those who don’t like diamonds, a tailor-made 24-carat solid gold iPhone 4.

Gresso has created a luxury back cover for the iPhone 4 that is made of 200 year old African Blackwood along with 18K gold detailing.

The back cover aims to make your iPhone 4 look a little different although it isn’t clear if the wood used is a replacement or cover for the current glass used.

Two versions are being created. The first is for women and contains an Apple logo in 18K gold along with Swarovski crystals. This version costs $3500.

Apple said Wednesday on the eve of the launch of the new iPhone that the white model would not be available for a month.

Apple said the white version of the iPhone 4, which also comes in black, was being delayed because of unspecified manufacturing difficulties.

White and black model iPhones had been scheduled to go on sale in stores in Britain, France, Germany, Japan and the United States on Thursday and Apple fans are already queuing up to buy the latest generation of the popular device.

The Tiffany & Co. Engagement Ring Finder app for iPhones allows brides and grooms to use their iPhone, iPod Touch, or iPad to find the perfect diamond ring.

For the men, the Tiffany iPhone app will show rings in their actual size, so they’re more likely to compare the on-screen rings with their partners.

The “ring sizer” aims to simplify ring sizing by stealing one of her rings, placing it on the screen and waiting for the correct ring size to pop up!

Apple unveiled a next-generation iPhone on Monday that features video chat, can shoot and edit high-definition quality video and has a crisper resolution screen.

“We are going to take the biggest leap since the original iPhone,” Apple chief executive Steve Jobs said as he showed off the “iPhone 4″ at Apple’s Worldwide Developers Conference here.

The iPhone 4 will go on sale on June 24 in Britain, France, Germany, Japan and the United States and will cost 199 dollars for the 16 gigabyte model and 299 dollars for the 32GB version.

The touchscreen smartphone, which comes in black and white versions, will be available in 18 other countries in July and 24 more in August.