Several trade names describe the color of topaz. This gem is "London blue," darker in tone than "Swiss blue" and "sky blue," and has a strong secondary green hue. Pebble Sprout. Used with permission.
Blue Topaz Faceted, Irradiated
Several trade names describe the color of topaz. This gem is "London blue," darker in tone than "Swiss Blue" and "Sky Blue," and has a strong secondary green hue. © Pebble Sprout. Used with permission.
Article: Blue Gemstones: 37 Varieties, Properties & Care Guide
Credit: Pebble Sprout
| Gemstone | Topaz |
| Treatments | Irradiation |
| Natural or man made | Natural |
| Gem State | Faceted |
| Color | Blue |
| Transparency | Transparent |