Glass laser engraving. Also thin-walled glass - MetaQuip laser
Custom Laser-Etched Photo Rocks Glass – CEB studio
Glass Laser Engraving & Etching – All You Need to Know | All3DP
How to Engrave Glass : 6 Steps - Instructables
How is a halogram etched WITHIN a solid block of glass? - Quora
Rocks Glass, Put Your Photography on a Glass, Family Photo, Laser Etched, Picture Glass, Personalized Wedding Gift - Etsy
Laser Etched Glass Cups – Ryder Engraving
3D Crystal - glass with engraving by Grüner Laser
Amazon.com: HDCRYSTALGIFTS 3D Hummingbird Crystal Ball Paperweight 60mm(2.3Inch) Laser Engraved Glass Sphere Display Globe Meditation Ball Home Decor with Metal Stand : Home & Kitchen