Illamasqua Fragile Nail Varnish ($16.00 for 0.50 fl. oz.) is described as a “speckled blue.” It’s a pale, airy blue cream base with small black glitter and then larger hexagon-shaped black glitter. I don’t have any specific dupes that mimic both the blue base and the accompanying black glitter pieces, but you might have a top coat that’s similar in glitter content, so I’d recommend trying it with these potential shades (that are similar to the blue base color): Zoya Blu and NARS Kutki.
Hourglass Luminous Light Ambient Lighting Powder ($45.00 for 0.35 oz.) is described as a “champagne pearl.” It’s a light peach with a white shimmer but really goes on mostly colorless on the skin. This shade is designed to “create a soft, incandescent candlelight glow.” It seemed just slightly brightening but added a fine sheen all-over the skin. When blended, I did not see any shimmer particles actually on the skin, though swatched heavily on the arm or hand will show some–but these seem to really blend and sheer out. The effect is, indeed, luminous. I would describe it as a step above glowy or a sheen, because I think the effect is a bit more obvious as a result of the sheen of the powder overall.