Thank you for your interest in our custom laser cutting service! The pendants shown in your examples look like they were laser-cut from mirrored acrylic sheets and laser-engraved from the back. We can certainly make parts just like them (we stock mirrored acrylic in several colors and can special-order others, or you may ship us your own material as well). You can see pictures of some of the materials we stock at https://www.pololu.com/docs/0J24/3 . You can also see pictures of laser-cut parts at https://www.pololu.com/catalog/product/749/pictures and some detailed descriptions of examples at the bottom of https://www.pololu.com/catalog/product/749.
In addition to the cost of the material, the price of laser-cut/engraved parts depends on how long it takes to cut and engrave the material. For the pendants in your example, most of the cost would come from the cutting/engraving time rather than the material cost. You can find a detailed description of our pricing at https://www.pololu.com/docs/0J24/2. Note that we typically do provide discounts on the cutting rate for larger orders, and we have a low minimum order of $25, which would cover at least a few copies of the pendants in your example.
Before you work on your file, please read about file setup at https://www.pololu.com/docs/0J24/5. It would be very helpful if you used different colors to distinguish cut lines from engraved areas. If this is your first time doing laser cutting, I recommend that you read our entire laser cutting guide in addition to the sections I've linked to above: https://www.pololu.com/docs/0J24.
Good luck with preparing your quote request, and if you have any questions, please don't hesitate to contact us!