Gold Jewelry Markings

I currently acquired a piece of jewelry set bracelet and necklace that have the markings of 750 in one corner as these are block types links around 1/2 these markings are on each corner next to the clasp.Its clasped together with a square/oval top type lobster claw. other marking in question.....STAR with 5 points 677 V1 NECKLACE STAR with 5 points 177 V1 Could you please help me identify these markings signify.
Thank you
Kristie