Q:
373 - 375 Jewelcrafting?
Your best bet is discovering a few more recipes.
Ive looked on the gw2wiki and i dont see anything that would help
If you just discover all your mithril recipes it will take you up to 380+. Make jewels 3 of each stone and make 1 of each kind of jewelry in discovery is enough.
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Just ensure you have discovered everything you can, that requires 350 skill level. Every amulet, ring, and band. You for sure, can get to 375, off discovery and making existing items that are at the 350 level. My other post on 375-400:
https://forum-en.gw2archive.eu/forum/game/crafting/Jewl-crafting-375-400/first#post406963