Selecting the ideal y axis for diamonds requires a blend of statistical rigor and market awareness. Comparing Shapes and Cuts The y axis must also accommodate the price variance between different diamond shapes.
Avoid Distortion: Why a Logarithmic Y Axis Prevents Diamond Price Misrepresentation
By setting a maximum that covers 95% of the trading volume, the y axis keeps mid-range diamonds visible while still acknowledging the existence of exceptional pieces without letting them dominate the visual space. Because diamond prices escalate exponentially with carat size and quality, a linear scale compresses lower-priced stones into a flat line while stretching expensive outliers into an unreadable spike.
A log axis treats a jump from 1 to 10 carats the same visually as a jump from 10 to 100 carats, even though the physical weight increase is identical. Understanding the Logarithmic Scale for Price For diamond pricing, a logarithmic y axis is almost always the superior choice.
Avoid Distortion: Why a Logarithmic Y Axis Prevents Diamond Price Misrepresentation
This prevents a shallow axis from exaggerating the gap and ensures that the y axis serves as a reliable metric for shape value rather than a visual trick. By using a log scale, you compress the wide range of prices into a visually manageable gradient.
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