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White IRCM sapphire cylinders These are approximately 20 mm long slices from longer sapphire rods which were intended to go into infrared countermeasures against heatseeking missiles (IRCM) back in the cold war
Note that the crystals are still not completely perfect
which is over four times that of diamond
Back in the 80s the US government spun up the SDI (Strategic Defense Initiative) program
The smaller piece weighs in at 34g and measures 23
Smoky Moissanite, Loose Golden Grey Moissanite Gems Marked Letter:7mm Square Cut (avg 1.8ct) White IRCM sapphire cylinders TheseThese 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.
