You will need to harvest a specific harvesting tier's primordial fragment (very rare - can come from any harvest node including fish) in order to make the primordial adornment you want. The adornment is heirloom.
Recipe:
primordial fragment x 1
Artisan's Amalgamation x 10
Tier appropriate coal x 200
Primordial Adornment of Power (Head) – +4% Crit Bonus +3% Potency (shimmering primordial fragment - tier 1 / levels 1-9)
Primordial Adornment of Furor (Hands) – +2% Flurry + 2% Potency (glowing primordial fragment - tier 2 / levels 10-19)
Primordial Adornment of Carnage (Forearms) – 5% AE Autoattack (sparkling primordial fragment - tier 3 / levels 20-29)
Primordial Adornment of Dominion (Legs) – +7% Potency (glimmering primordial fragment - tier 4 / levels 30-39)
Primordial Adornment of Elusiveness (Feet) – +1% Extra Dodge Chance (aka 1% Uncontested Avoidance) (luminous primordial fragment- tier 5 / levels 40-49)
Primordial Adornment of Destruction (Head) – +3% Crit Bonus +4% Potency (lambent primordial fragment - tier 6 / levels 50-59)
Primordial Adornment of Talent (Hands) – +2% Spell Doubleattack +2% Potency (scintillating primordial fragment - tier 7 / levels 60-69)
Primordial Adornment of Precision (Forearms) – +8% Accuracy (smoldering primordial fragment - tier 8 / levels 70-79)
Primordial Adornment of Force (Legs) – 7% Crit Bonus (ethereal primordial fragment - tier 9 / levels 80-89)
Primordial Adornment of Calamity (Feet) – +750 Ability Mod (effulgent primordial fragment - tier 10 / levels 90-100)