SHE is gowned in a black dress sewn with tiny emeralds, rubies, sapphires too small to detract from the darkness of her gown, instead giving it the illusion of a rainbow sheen.
Following "gowned" so closely with "dress" is awkward, because the latter is redundant. Consider, e.g., "She is gowned in black, the fabric sewn with..." Using both "gowned" and "gown" in the same sentence compounds the problem. Consider introducing further information about the fabric: e.g., "the darkness of the velvet" or "the darkness of the silk".
Whoof. Made it through the first sentence.
"Yarrgh. Another crew of bushy tails, more wet behind the ears than 'tween the legs. You've no idea what's in store for you, but these eyes, these old eyes have seen things. Like the great injector malfunction of aught-six..."