Very desirable gems, often go for 1 alch-2 chaos (or more if they are incredibly sought after) with 0% quality.Guess id start at the top, most desirable (all 0% quality):Greater Multiple Projectiles Support (3-4 GCP, 3 chaos is approximately 1 gcp)Chain Support(2-4 GCP)Concentrated Effect Support (1-4 Chaos)Elemental Hit (1-3 Chaos)Added Chaos Damage Support (1-3 Chaos)Spell Totem Support(1-3 Chaos)Mana Leech Support(1-3 Chaos)Reduced Mana Cost Support (1-3 Chaos)Life Leech Support (1-2 Chaos)Faster Attacks Support (1-2 Chaos)Faster Casting Support (1-2 Chaos)Increased Elemental Damage Support (1-2 Chaos)Culling Strike Support (1-2 Chaos)Elemental Proliferation Support (1-2 Chaos)Item Rarity Support (1-2 Chaos)Item Quality Support (1-2 Chaos)Lesser Multiple Projectiles Support (1-2 Alchs, 2 alchs is approximately 1 chaos)Elemental Weakness Curse (1-2 Alchs)The list is mostly comprised of support gems that are universal or mostly universal and gems that are from drops only and are also sought after (elemental hit, elemental weakness) or both (GMP, chain).