0.70 Ct. Green Sapphire from Thailand

This 0.70 carat oval green sapphire is a finely calibrated example of corundum craftsmanship, presented by The Natural Sapphire Company. The stone measures 6.82 by 4.61 by 2.42 millimeters, a proportion that yields an elegant oval outline with a length to width ratio of approximately 1.48, ideal for elongating the finger in a finished ring while maintaining visual balance in pendants and earrings. The gem is transparent with intense color intensity, and it carries a clarity grade described as very very slightly included when evaluated at eye level, indicating that any natural inclusions are minute and do not interrupt overall transparency. The piece has been heat treated, a stable and widely accepted enhancement that improves color saturation and transparency, and it is sourced from Thailand, a region known for producing sapphires with attractive green and bluish green tones.

Cutting and facet architecture are central to this sapphires appeal, and the mixed brilliant cut applied here is executed to maximize both scintillation and depth. The cutter has combined a brilliant style crown with a pavilion that favors angular facet planes to control light return, producing crisp flashes from the crown facets while maintaining a deep, lively body color through the pavilion geometry. The measured depth of 2.42 millimeters yields a depth proportion of approximately 42 percent relative to the average of the length and width, a depth that supports strong internal reflection without creating a visually dark center. Facet junctions are tight and symmetrical, and the excellent polish enhances facet contrast and minimizes light leakage, resulting in even return of brightness across a broad range of viewing angles. The mixed brilliant approach is particularly effective in oval forms, because it softens the potential for bow tie effect and preserves the gem s color saturation along the longer axis.

From a color science perspective this green sapphire exhibits an intense saturation with a tone that sits in the medium to medium deep range, offering a vivid green that can read as yellowish green or bluish green under different lighting conditions due to pleochroic behavior inherent to corundum. Intense color intensity in sapphire grading implies that saturation is strong enough to be clearly present without becoming overly dark, and in this specimen the hue is evenly distributed with minimal zoning thanks to the precise lapidary work. The very very slightly included clarity grade at eye level means that magnification will reveal only minor natural features, commonly fine rutile needles or microscopic healed fractures, which in some cases act to increase the visual richness of the gem by diffusing light. The heat treatment applied to this stone is intended to reduce the visibility of silk and to deepen and stabilize the green hue, and when performed responsibly on naturally occurring material it produces long term stability that is compatible with routine jewelry wear.

Durability and care considerations are important when selecting a gemstone for daily wear, and sapphires excel in this regard. As corundum this green sapphire ranks nine on the Mohs scale, making it second in hardness only to diamond, which rates ten on the same scale. To provide direct comparisons, emeralds typically range from seven and a half to eight on the Mohs scale, quartz sits at seven, and topaz is around eight, so the 9 rating indicates exceptional resistance to scratch and abrasion in normal use. Beyond hardness, corundum has no true cleavage planes, and its toughness is very good, attributes that reduce the risk of chipping relative to more brittle materials. For practical jewelry design, this means the stone is well suited to rings, bracelets, pendants, and earrings, though prudent setting choices such as protective bezels or secure prong systems are recommended for high wear pieces to guard against hard knocks. Cleaning is straightforward, warm soapy water and a soft brush will maintain brilliance, and ultrasonic cleaning is generally safe for heat treated sapphires that have not been fracture filled, however we advise that customers consult The Natural Sapphire Company for confirmation and for professional cleaning and inspection services, ensuring the longevity and continued beauty of the gem.