1.69 Ct. Blue Sapphire from Australia

This exquisite marquise shape blue sapphire from The Natural Sapphire Company weighs 1.69 carats, with dimensions of 11.66 by 5.50 by 3.33 millimeters, and it presents as transparent with a dark color intensity. The mixed brilliant cut marries the scintillation of brilliant facets on the crown with the elongated elegance of a marquise outline, producing a balance of fire and deep velvety blue that flatters both rings and pendants. Clarity is graded as very slightly included when evaluated at eye level, a practical and trade respected grade that indicates only minor internal features which do not materially detract from face up appearance or light performance. The excellent polish enhances facet definition and surface luster, while the stone retains appealing weight for its dimensions, offering a strong presence on the finger without appearing bulky. Heat treatment has been applied, a stable and widely accepted enhancement that improves color saturation by reducing certain inclusions and modifying iron and titanium related chromophores, and this treatment is considered permanent under normal wear conditions. Origin is Australia, a source known for sapphires with deep, inky blues and reliable supply chains, and provenance from this region contributes to the stone's desirability among educated buyers who value both character and consistency.

On a geological timescale this sapphire began as corundum crystals forming millions of years ago within the earths crust under conditions of high temperature and pressure, where aluminum rich host rocks interacted with oxygen and trace amounts of iron and titanium. In Australian deposits these crystals commonly nucleated in basalt related environments or in metamorphosed host rocks, slowly growing as atoms migrated and arranged into the dense trigonal lattice that gives sapphire its remarkable hardness and durability. Over geological time weathering and erosion liberated crystals from their primary host, transporting them into alluvial deposits where they were eventually recovered by miners. The mixed brilliant marquise you see here carries that deep time story in its color zoning and internal features, and our gemological team at The Natural Sapphire Company has evaluated, graded, and finished the sapphire to maximize its optical return while preserving its natural character and documented origin, making it an informed and lasting choice for a collector or for a piece designed to be treasured for generations.