A few close-ups of the packaging
Don't worry about dropping them. The bottles are made of plastic and rubber-like material with a pump.
Pearl, as its name suggests, is a pearly white with extremely delicate white shimmer. When I first pump it out, it looks stalky white and nothing like a shade that can match with the rest of my face. However, it blends seamlessly into my skin and quite sheer. I have medium, yellow undertone and Pearl doesn't wash me out or concentrate into white stripes on my cheekbones.
Opal is an apricot with coppery champagne shimmer. Like Pearl, the shimmer is finely milled, creating a from-within glow that is incredibly natural. Opal compliments my skin tone really well and better than Pearl. I would recommend Opal for warm skintone. If you're on the cooler side, it might not look as natural.
Side by side outdoors
The only drawback of these goodies is the setting time, around 10-15 minutes, which doesn't break the deal. I don't complain much since liquid formula tends to require more time to stabilize on skin in compensation for the ease of blending and natural looking effects.
More swatches indoors (using heavy hands on Pearl!)