So many things to keep track of here! We should probably pick female for Diamond to make them somewhat balanced.
Balanced? As if 3.5 was ever balanced!
I'm more inclined to follow the original sources and leave Diamond's gender unstated. Just use "they" and the like if a pronouns required.
Never put off until tomorrow what you can put off until the day after tomorrow!
What would you like to work on next for Opal?
Well it's been more than one tomorrow so I'd better get started.
Just updated the Breath Weapons with the various neutral dragons.
Now it's time for the other special abilities/special qualities. Let's see what do we have…
Amber: blink, wild shape
Jacinth: blink, blinding hide,
charm animal, suggestion, dominate animal, charm monster
Jade: immunity to sonic,
plane shift, detect thoughts, shatter, sculpt sound, song of discord, demand
Moonstone: planar travel,
Tasha's hideous laughter, awesome presence,
deep slumber, dream,
false vision, Otto's irresistible dance, temporal stasis
Mystaran Jade: camouflage, water breathing,
enlarge, commune with nature, greater command, hold monster
Mystaran Onyx: camouflage, blindsight, water breathing,
hold animal, corrupt water, blight, black tentacles, contagion
Pearl: hold breath,
blink, control water, beguile,
hallucinatory terrain, solid fog, roar of freedom,
control weather
Hmm, he has blink multiple times. Wasn't expecting that!
Most of them are SLA which are fairly straightforward.
Combining them all we have:
Spell-Like Abilities: At will—
detect thoughts (DC ##),
plane shift; 18/day—
blink; 3/day—
black tentacles (DC ##),
charm animal (DC ##),
control water (DC ##),
deep slumber (DC ##),
entangle (DC ##),
false vision (DC ##),
greater command (DC ##),
hideous laughter (DC ##),
hold animal (DC ##),
sculpt sound (DC ##),
shatter (DC ##),
solid fog (DC ##),
song of discord (DC ##),
suggestion (DC ##); 1/day—
blight (DC ##),
charm monster (DC ##),
commune with nature (DC ##),
contagion (DC ##),
control weather (DC ##),
demand (DC ##),
dominate animal (DC ##),
hallucinatory terrain (DC ##),
hold monster (DC ##),
irresistible dance (DC ##),
temporal stasis (DC ##). Caster level 20th. The save DCs are Charisma-based.
The other Special Attacks are mostly fairly straightforward:
Awesome Presence (Su): Moonstone dragons do not have a fear aura as do most other dragons. Instead, creatures with HD less than the dragon caught in the aura that fail their Will saves are fascinated while the dragon is present. After the dragon departs, they lose all memory of the encounter.
Beguile (Su): A jade dragon often speaks in riddles. When it speaks for one full round, all creatures within 10 feet per age category must succeed on a Will save or become
enthralled (as the spell). Beguile is a sonic, mind-affecting, language-dependent charm effect. A creature that successfully saves cannot be affected again by the same jade dragon's beguile ability for 24 hours. The save DC is Charisma-based.
Blinding Hide (Ex): In areas of natural sunlight or a
daylight spell, a young or older jacinth dragon's hide reflects the sun so brightly that any creature within range (10 feet x dragon's age category) viewing the dragon must succeed on a Fortitude save (DC equals breath weapon DC) or be blinded for 5d6 rounds. A creature that successfully saves is instead dazzled for 1d4 rounds.
Camouflage (Ex): Since a Mystaran jade dragon looks like a green dragon in areas of shadowy illumination or darkness, it takes a DC 20 Spot check to notice its true nature. Anyone with ranks in Knowledge (arcana) can use that skill instead of Spot to notice the difference. Because the resemblance is only visual, creatures with the scent ability automatically notice the difference.
Camouflage (Ex): Since a Mystaran onyx dragon looks like a black dragon in areas of shadowy illumination or darkness, it takes a DC 20 Spot check to notice its true nature. Anyone with ranks in Knowledge (arcana) can use that skill instead of Spot to notice the difference. Because the resemblance is only visual, creatures with the scent ability automatically notice the difference.
Corrupt Water (Sp): Once per day an adult or older onyx dragon can stagnate 10 cubic feet of water, making it become still, foul, and unable to support animal life. The ability spoils liquids containing water. Magic items (such as potions) and items in a creature’s possession must succeed on a Will save (DC equal to that of the dragon’s frightful presence) or become fouled. This ability is the equivalent of a 1st-level spell. Its range is equal to that of the dragon’s frightful presence.
Dream (Su): As the spell, except that a moonstone dragon can only send itself to the recipient's dream at will as a standard action.
Hold Breath (Ex): A pearl dragon can hold its breath for a number of rounds equal to 24 x its Constitution score before it risks drowning.
Planar Travel (Su): A moonstone dragon can plane shift between the Ethereal Plane and the Material Plane or the Plane of Faerie (if it exists in your cosmology) as a standard action, though it takes care to avoid places exposed to direct sunlight.
Roar of Freedom (Su) Three times per day, an ancient pearl dragon can utter a thrilling roar that functions as a
break enchantment spell on the dragon or a single willing ally within 30 feet. The caster level equals the dragon's caster level.
Wild Shape (Su): A young adult or older amber dragon can wild shape just as a druid of the same caster level, with the following restriction: The amber dragon can only assume animal shapes of tiny to huge size, and it can only choose one animal form for each use of wild shape it possesses. It need not use each wild shape use on a different animal. Thus a very old amber dragon could wild shape up to four times per day and has access to four different animal forms of tiny to huge size to choose from. If the dragon later gains the wild shape ability from class levels, the uses per day stack and it uses the limitations of its innate ability or the class, whichever is better for the dragon.