: This is the most important factor [15, 27]. The most prized is a velvety royal blue or a bright "cornflower blue" with medium to medium-dark tones [4, 15, 22].
: While most sapphires have natural "inclusions," look for eye-clean stones where no flaws are visible to the naked eye [4, 15, 29]. Sapphire Blue
: Ranking a 9 on the Mohs scale , sapphires are the second hardest natural gemstones after diamonds [4, 17, 28]. This makes them exceptionally durable for everyday jewelry, such as engagement rings [21, 23]. Famous Sapphire Pieces Famous Gemstone Key Characteristic The Logan Sapphire 423.29 carats : This is the most important factor [15, 27]
: Stones from Kashmir are the rarest and most expensive due to their "sleepy" velvety look, followed by highly-sought Burmese and Sri Lankan (Ceylon) sapphires [15, 26, 30]. : Ranking a 9 on the Mohs scale
Famous for its "star" (asterism) visible on both sides of the stone [14, 17]. American Museum of Natural History [6, 14] 392.52 carats