We know that in DS cracked gems, in FC broken gems, chiped in award, unique gems from some bosses. There have very low drop rate. Azrael, super gams, cap gem glove gems, only in mall. Black dragon gems only for the high level(Pet Forest) guilds.

Its unlikely you can be much good on mistic ocean as a non-maller you should maybe go to Grand line and join a FC or DS guild. learn how to boss and to pk and get some gold (gold there has value u can buy imps with gold from refs for exemple). In FC DS in mistic people are probably wearing level 7 az gems and rebirthed by card etc so not much for a non maller newbie to do there. Although the equipement for PvE are easy and cheap to get, In PvP you dont stand eny chance on thoses old servers..

By the way there are lot of ways to gain money, equips and items. First of all you need constantly to level your char level 67 is low level nothing much from DW Farming or Summer island ches. You can be online 90H and get credits each mont , buy rations or something for selling. Dont buy wings, aparels or junk to save money. And you can farm nss and make noob char to open them.

Then you got semething good dont trade it for junk equips put it on stall and sell expensive. Be smart look stalls all day sometime ppl make misstakes and put one "0" less so what is 25 mil eg can be 2,5 mil. It depends what lvl you are and what lvl you want to be. You can get equipment from MOBS. If you are in Pet Forest Gold you can get good lower level equipment from evil crystal or from killing tokens.