If your tastes in engagement rings and/or wedding bands tends to lean toward the less traditional, I have a few online window shopping finds to share with you.
These rings by Todd Reed are made with rose-cut and raw natural diamonds:

source
I love designer Zoë Chicco and this ring is quite appropriate for tying the knot, don't you think? It's also available in other metals:

source
I found this adorable ring at Jennifer Kaufman. Bonus: it also comes in silver:

source
I've been eyeing this one by Etsy seller Cherry Creek forever, but do I get my intials or Mr. Cheetah's? Maybe I should just play it safe and get both ;):

source
This statement piece is from Etsy seller Tooli's Jewelry:

source
I'm a sucker for anything with roses on it. Love this ring from Wexford Jeweler's Etsy shop:

source
Or stray even further from the traditional and opt for a engagement/wedding necklace, bracelet, or earrings:
This necklace from Max & Chole could also be a great bridesmaid gift:

source

source
Emerald and diamond earrings from Blue Nile:

source