Key Features of a Top-Quality Bi-Color Tourmaline (5.40 ct)

1. Carat Weight

• 5.40 ct is considered a large size for tourmaline, especially if it’s high quality.

• Larger bi-color tourmalines are much rarer and more valuable.

2. Bi-Color

• “Bi-color” tourmaline typically features two distinct colors within a single crystal—common combinations include:

  • Pink and green (e.g., watermelon tourmaline)

  • Blue and green

  • Red and yellow

• The value increases if the color transition is sharp and natural (not blended or muddy).

3. Quality Grading

Top-quality tourmaline would exhibit:

• Excellent clarity (eye-clean or near flawless)

• Vivid, saturated colors

• Natural origin (not treated or enhanced)

• Expert cut that maximizes brilliance and shows off both colors distinctly

4. Shape and Cut

• Common cuts: Emerald, shapes that highlight the bi-color zoning.

• Precision cutting enhances the contrast between the two colors.

5. Origin

• Premium bi-color tourmalines often come from:

  • Afghanistan