Aquamarine is the bright blue variety of beryl species. Its colour can be pale to dark blue or greenish blue which is caused by iron trace elements. Depending on the transparency of the stone which can be anything between transparent to almost opaque, aquamarines are cut into faceted gems, cabochons, beads or carvings and occasionally rough crystals are left intact in their hosting rocks and sold as gorgeous rough specimens. A typical inclusion of the stone is known as ñrainî and consists of parallel growth tubes. AquamarineÍs lustre is vitreous, it rates 7.5-8 on the Mohs scale which makes it suitable for jewellery that has secure settings to protect the stone from wear;Stone Size (mm): 4.5mm;Carat Weight (ct): 0.58