Smoky Moissanite, Loose Golden Grey Moissanite Gems Marked Letter:7mm Square Cut (avg 1.8ct) These are lab created sapphires

These are lab created sapphires which were grown for use as a sensor window in the F35 fighter jet but didn't meet spec

and Nd YAG lasers are the most versatile and widely-used

give peas a chance

Note that the crystals are still not completely perfect

Smoky Moissanite, Loose Golden Grey Moissanite Gems Marked Letter:7mm Square Cut (avg 1.8ct) These are lab created sapphiresThese are faceted smokey golden grey moissanites with a color very similar to smoky quartz but much greater brilliance and durability. This is moissanite, also known as silicon carbide. It is an excellent gem, with incredible hardness (around 9. 25 9. 5) and greater brilliance and fire than a diamond. It is perfect for use in all kinds of jewelry. Though it is well known in the gem world it is also highly valued in the world of science and industry.