The "Download Now" link directs you to the iTunes App Store, where you must continue the download process. You must have iTunes installed in order to open the link, and you must have an active iTunes account to download the application. This download may not be available in some countries.
From Mark Softech:
Diamond auctions used to be held using hand signals.JPDEX introduced information technology (IT) to such auctions, creating a fair and efficient "bid4diamonds," which eliminates people's self-serving traits, we introduced Internet-based "Internet Live Auction" service. Thus, JPDEX provides the largest, convenient diamond auction service in Japan, which can be accessed from anywhere in the country.The Internet has made it possible for members to take part in auctions held at on-site auctions. Participants can check diamonds information displayed on their PCs or iphone before auctions and preview and check the diamond at JPDEX officeMembers that have put their diamond up for auction can check the progress of bidding in real time.