Heated only top blue 4.21ct Sapphire set

This is a 25 piece set cut from pure high grade Madagascar sapphire that was heated only, with no dyes or fillers, just pure sapphire. Measuring between 2.5mm and 3mm each they're well matched in size, and are filled with ink blue to royal blue hues and glittering flashing. They have a Mohs hardness rating of 9 out of 10 and are perfect for setting.