This particular line has been drawn during the grows of the stone, it is made of 2 lines, one clear and one dark blue showing an unusual relief effect crossing the star.
23.57 cts. Star Sapphire trillion single
16.1 X 16.3 mm. Depth: 9.6 mm. Really a collector's stone
Enhancement: none (N)
stone PRICE USD 5892.00
ref. SAstT2357 ORIGIN: Madagascar
The bottom of this stone is flat which is always desirable in stars so you don't need to pay for a heavy bottom, this stone will be easy to set.