Amber Dragon - Sticky sap dragon, 30ft cone hot sap hardens to resin, small and reclusvie Druids who hang out with fey (sprites, brownies)
Amethyst Dragon - Most powerful gem dragon after Saridor, wise and majestic and aloof and disinterested, Breath: Concussive force and Exploding gem weapon, Psychic, force spells and telekinesis
Crystal Dragon - friendly and talkative (even if they have to charm you first), Breath: Cone of radiant crystals, animosity to white Dragons and Frost giants
Emerald Dragon Inquisitive but paranoid and distrustful of visitors, trapped lairs, Breath: Sonic keening, live in extinct volcanoes
Jacinth Dragon - solitary loners, can use blink, Breath: Hot Air, live in deserts
Jade Dragon - oriental cousin of the Emerald, uses riddling talk to cast suggestion
Obsidian Dragon - most intelligent and most vicious, Breathed fire and used Fire-base psionics/magic, liked to grapple then planeshift to plane of fire
Pearl Dragon - Aquatic dragons, reclusive and non-aggressive, Breath: scalding steam, pearl divers
Sapphire Dragon - Militaristic and antisocial, skilled in clairsentience, psychokinesis and psychoportation , Breath: Sonic blast
Topaz Dragon - selfish and highly erratic, Breath: cone of dehydration, immune to cold, doesnt like water but lives by the sea, and can planeshift to plane of water too!
I do note the Fey Moonstone Dragon isnt listed…