The star is asymmetrical but is roughly 11mm long by 10mm wide. The diamonds are 1mm and there are 13 of them.
This is both marked 750 and I tested it. It weighs 2.5 grams. This is in very good condition. Please look at all of the pictures and check out my other auctions. Long 18K Gold Black Diamond Pendant Star Chain's Gold / Black Rhodium" is in sale since Wednesday, August 14, 2019.
This item is in the category "Jewelry & Watches\Fine Jewelry\Fine Necklaces & Pendants\Diamond". The seller is "costumefan" and is located in Longview, Washington. This item can be shipped worldwide.