750 Stamped On Jewelry. So au750 just means the piece of jewelry is 18 karat gold. For example, the number 750 stamped on a piece of jewelry means that 75% of it is gold, which corresponds to 18 karats.

Overall, it is not thick bracelet, but it looks so elegant on my hand. Not to mention i accidentally ordered the wrong style and they took care. There is also other writing but can't make it out.
18k gold hallmarks, means 75% gold.
750 Stamped On Jewelry. 585 could be the maker, i'll take a look. You'll receive email and feed alerts when new items arrive. These stamps are all made of hardened steel to easily decorate your jewelry items. I am glad i bought this bracelet to match my necklace.