MHW: Deco List

Level 1 Gems
(R5) Aquatic Expert
(R8) Artillery
(R7) Attack Boost
(R6) Blast Attack
(R5) Blast Resistance
(R5) Bleeding Resistance
(R6) Blight Resistance
(R6) Bombardier
(R5) Botanist
(R6) Critical Eye
(R6) Defense Boost
(R5) Divine Blessing
(R6) Dragon Attack
(R5) Dragon Resistance
(R5) Effluvia Resistance
(R5) Entomologist
(R6) Fire Attack
(R5) Fire Resistance
(R5) Fortify
(R5) Free Meal
(R5) Geologist
(R7) Guard
(R6) Health Boost
(R5) Heavy Artillery
(R6) Horn Maestro
(R5) Hunger Resistance
(R6) Ice Attack
(R5) Ice Resistance
(R5) Iron Skin
(R6) Item Prolonger
(R5) Intimidator
(R8) Mushroomancer
(R5) Palico Rally
(R6) Paralysis Attack
(R5) Paralysis Resistance
(R6) Poison Attack
(R5) Poison Resistance
(R6) Quick Sheath
(R6) Recovery Speed
(R6) Recovery Up
(R5) Resuscitate
(R5) Scenthound
(R6) Sleep Attack
(R5) Sleep Resistance
(R6) Slinger Capacity
(R7) Special Ammo Boost
(R6) Speed Eating
(R6) Speed Sharpening
(R5) Sporepuff Expert
(R6) Stamina Thief
(R5) Stealth
(R6) Stun Resistance
(R6) Thunder Attack
(R5) Thunder Resistance
(R5) Tool Specialist
(R6) Water Attack
(R5) Water Resistance
(R6) Wide-Range

Level 2 Gems
(R6) Affinity Sliding
(R7) Agitator
(R5) Airborne
(R8) Bow Charge Plus (Legi 4✦)
(R8) Capacity Boost
(R6) Constitution
(R8) Critical Boost
(R8) Critical Draw
(R6) Evade Extender
(R6) Evade Window
(R8) Focus
(R7) Guard Up (Uragaan 3✦)
(R7) Heroics
(R7) Latent Power
(R8) Marathon Runner
(R7) Maximum Might
(R8) Mind Eye/Ballistic (Rath 4✦)
(R6) Non-Elemental Boost (Diablos 4✦)
(R6) Partbreaker
(R7) Peak Performance
(R7) Power Prolonger
(R7) Protective Polish (Odo 4✦)
(R7) Resentment
(R6) Slugger
(R7) Stamina Surge
(R6) Tremor Resistance
(R6) Weakness Exploit
(R6) Windproof

Level 3 Gems
(R7) Blast Functionality
(R6) Earplugs
(R7) Elderseal Boost
(R6) Flinch Free
(R8) Free Elem/Ammo Up
(R7) Normal Shots
(R7) Paralysis Functionality
(R8) Piercing Shots
(R6) Poison Functionality
(R7) Sleep Functionality
(R8) Spread/Power Shots
(R8) Handicraft

Dummied (Not currently implemented in game, only placeholders. will probably unlock with a content patch or event)
(R5) Mudproof- Mudshield Jewel 1
(R5) Dungmaster - Fertilizer Jewel 1
(R5) Leap of Faith - Flying Leap Jewel 1
(R5) Master Fisher - Angler Jewel 1
(R5) Spitmaster - Chef Jewel 1
(R5) Transporter - Transporter Jewel 1
(R5) Gathering - Gathering Jewel 1
(R5) Honey Hunter - Honeybee Jewel 1
(R6) Carving Pro - Carver Jewel 1
(R5) Scoutfly Range - Scoutfly Jewel 1
(R5) Speed Crawler - Crouching Jewel 1
(R5) Jump Master - Longjump Jewel 1
(R5) Cliffhanger - Climber Jewel 1
(R5) Blindsider - Radiosity Jewel 1
(R5) Scholar - Research Jewel 1
(R5) Effluvial Expert - Hazmat Jewel 1
(R5) Res Down Protection - Element Resist Jewel 1
(R5) Rare Hunter - Detector Jewel 1
(R6) Dive Distance - Slider Jewel 1
(R5) Heat Guard - Heat Resist Jewel 2
(R5) Rare Gather - Discovery Jewel 2
(R6) Mounting - Rodeo Jewel 2
(R8) Power Functionality - Powercoat Jewel 3

Unknown Status, likely not in game:
(R?) Stamina Cap Up (Anja 4✦)
(R?) Adrenaline (Anja 2✦)
(R?) Bludgeoner (Diablos 2✦)
(R?) Capture Master (Kirin 3✦)
(R?) Critical Element (Rath 2✦)
(R?) Critical Status (Zorah 3✦)
(R?) Good Luck (Legi 2✦)
(R?) Guts (Bazel 3✦)
(R?) Hasten Recovery (Nerg 3✦)
(R?) Master's Touch (Teo 3✦)
(R?) Nullify Wind Pressure (Daora 3✦)
(R?) Poison Duration Up (P.Rath 3✦)
(R?) Punishing Draw (Odo 2✦)
(R?) Razor Sharp/Spare Shot (Xeno 3✦)
(R?) Super Recovery (Vaal 3✦)