The rim
The top edge of a glass or cup is called the rim.
The sharp edge of a pane of glass is called a "cut edge." This edge is typically created during the cutting process and can be smoothed or polished for safety reasons.
The gunnel.
On the upper edge of each side
That would be called a "hobnail glass plate." These plates are known for their decorative raised bumps or balls around the edge which resemble hobnails.
The front is edge - to - edge glass.
The term for the projecting upper edge of a steep place is "precipice."
The edge of a boat is commonly referred to as the "gunwale." It is the upper edge of the side of a boat, where the hull meets the deck. Gunwales provide structural support and are often used for securing lines or attaching accessories.
The upper edge of a ship's side is called the "gunwale." It is the top of the ship's side and provides structural support as well as a place for crew and equipment. The term is commonly used in the context of boats and smaller vessels as well.
rim
on the upper edge of each side
Impure glass has traces of iron which absorbs red and blue, allowing for an apparent green color on the edge if the glass has signifcant depth, e.g., shelf glass. While it is possible to get purer glass, some green will remain as there will always be traces of iron.