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- Type: [Gemstone name, natural sphene

- Carat Weight: [Weight in carats, 2.79 carat

- Cut: [Cut style, cushion step cut

- Color: [Color, yellowish green]

- Clarity: [Clarity grade, e.g., Very Very Slightly Inclusion(vvs)

Sphene (also known as Titanite) is a rare and exotic gemstone with a distinct appearance. Here's a definition:

Sphene:

- Chemical composition: Calcium titanium silicate (CaTiSiO5)

- Crystal structure: Monoclinic

- Hardness: 5-5.5 on the Mohs scale

- Luster: Adamantine (diamond-like) to resinous

- Colors: Typically yellow, orange, brown, green, or black; can display pleochroism (color change) under different lighting

- Transparency: Transparent to translucent

- Rarity: Relatively rare, especially in gem-quality crystals

Sphene is prized for its unique blend of colors, high dispersion (fire), and rarity. It's a sought-after gemstone among collectors and connoisseurs.