There's 3 types of Insurgent rings.
Brooch - gives range attack
Necklace - gives melee attack
Chain - gives magic attack
Here are the stats for Insurgents, keep in mind the ones with (??) after them I was unable to confirm as the actual stats but based them off of my calculations based on the rings that I know are correct. All rings without (??) after them I have actually seen in-game so I know those are correct.
Please note that (att) does not mean to all attack but is the specific attack gained based on which Insurgent ring you have, ie. Brooch, Necklace, Chain.
Level Requirement 90
Base 12 all stat 20 att
+0 = 12 all stat, 20 attack
+1 = 17 all stat, 25 attack
+2 = 22 all stat, 31 attack
+3 = 27 all stat, 37 attack
+4 = 32 all stat, 44 attack
+5 = 38 all stat, 52 attack
+6 = 44 all stat, 61 attack
+7 = 50 all stat, 71 attack
+8 = 57 all stat, 81 attack
+9 = 64 all stat, 93 attack
+10 = 71 all stat, 106 attack
+11 = 79 all stat, 120 attack
+12 = 87 all stat, 135 attack
+13 = 96 all stat, 153 attack
+14 = 105 all stat, 171 attack
+15 = 114 all stat, 192 attack
+16 = 124 all stat, 215 attack
+17 = 134 all stat, 140 attack
+18 = 145 all stat, 267 attack
+19 = 157 all stat, 298 attack
+20 = 169 all stat, 331 attack
+21 = 181 all stat, 368 attack
+22 = 195 all stat, 408 attack
+23 = 209 all stat, 452 attack
+24 = 223 all stat, 501 attack
+25 = 238 all stat, 555 attack
+26 = 255 all stat, 614 attack
+27 = 271 all stat, 679 attack
+28 = 289 all stat, 751 attack
+29 = 308 all stat, 829 attack
+30 = 327 all stat, 916 attack
All Grade A
80 - Crystals
40 - Option Stone Crystals
5 - Sapphires
2 - Diamonds (10 Sapphires)
6 - Extraction Option Stones