Abstract: An online marketplace embodied in a computer system for facilitating investment in diamonds is disclosed. The online marketplace includes a database for storing customer records, wherein each customer record includes identifying information for a customer, contact information, an investment profile, and electronic payment information, and diamond records, wherein each diamond record includes identifying information for a diamond, characteristic information, certification information, and price information. The online marketplace further includes a server on a network and a processor configured for publishing the diamond records on a publicly available forum via the network, providing to customers a graphical user interface for allowing customers to search for and browse the diamond records, and executing a matching algorithm that determines which diamond records most closely match a customer, based on the information in the corresponding customer record, namely, the customer's investment profile.

Abstract: A method and apparatus for a tracking door centering system. An apparatus may comprise an elongate member, a first centering track, and a second centering track. The elongate member may have a first end and a second end capable of being rotatably mounted to a door along an axis that may be substantially parallel to a horizontal centerline. The first centering track may be mounted on the first end. The second centering track may be mounted on the second end. The first centering track and the second centering track may be movable to reduce rotational movement of the door during movement of the door about a vertical centerline when a first follower is engaged in the first centering track and a second follower is engaged in the second centering track.

Abstract: A method and apparatus for a tracking door centering system. An apparatus may comprise an elongate member, a first centering track, and a second centering track. The elongate member may have a first end and a second end capable of being rotatably mounted to a door along an axis that may be substantially parallel to a horizontal centerline. The first centering track may be mounted on the first end. The second centering track may be mounted on the second end. The first centering track and the second centering track may be movable to reduce rotational movement of the door during movement of the door about a vertical centerline when a first follower is engaged in the first centering track and a second follower is engaged in the second centering track.