Which gem is rarely seen weighing over 5 carats in fine quality?

• A. Ametrine
• B. Demantoid
• C. Phosphosiderite
• D. Tsavorite

Answer: (D)

Size and quality in colored gemstones are driven by how the crystal forms and how cleanly it can be cut. For Tsavorite, the vivid green color comes with a tendency toward inclusions and color zoning in larger crystals. As carat weight increases, these flaws become more visible, making it much harder to find large stones that are both highly transparent and strongly saturated. That combination—large size with gem-grade clarity and color—is rare, so fine-quality stones over five carats are uncommon. In comparison, ametrine and demantoid can be cut into larger, high-quality stones more readily, while phosphosiderite is typically too soft and brittle for sizable, durable jewelry pieces, so large, fine-quality examples are not common.