5. Diamond Crypto Smartphone
Based on Windows CE, this smart phone was designed by luxury accessories maker Peter Aloisson. This unique object de art is priced at a crisp $1.3 million and is tagged as the costliest in the world. This one features a cover adorned with 50 diamonds, 10 of which are the rare blue ones. Apart from this, it also features s few sections made in rose gold as well. It also gives protection against kidnapping and technological blackmail.