Two tumbled stones from the same mineral family can give very different first impressions. One may have vivid color and a glassy polish, while another keeps softer tones, visible texture, and a less uniform shape.
Those differences become easier to compare when the grade has a defined meaning. Legacy Crystals and Minerals uses an in-house AAA, AA, A, and B scale for tumbled stones based on color, polish, shape, and natural surface character.
What the Grade Actually Tells You
Letter grades describe the presentation of a tumbled stone. Legacy Crystals and Minerals assesses color and pattern, polish and luster, shape and symmetry, and the way natural inclusions or surface features affect the finished piece.
Higher grades generally move toward richer color, smoother polish, and more consistent shaping. A and B grades retain more organic variation, which can be appealing when you prefer natural texture over a highly refined finish.
The scale belongs to Legacy Crystals and Minerals. Other sellers may use the same letters differently, so the published criteria are what make the grade useful during comparison.
Compare the Four Tumbled Stone Grades
| Grade | Color and Pattern | Polish and Surface | Shape | Character |
|---|---|---|---|---|
| AAA | Deep, vivid, and generally uniform | Mirror-like with minimal surface interruption | Highly balanced | Refined and highly polished |
| AA | Strong color with attractive natural variation | High gloss with minor natural texture | Consistently shaped | Smooth and presentation-ready |
| A | Natural tones with more variation | Good polish with small pits or matte areas possible | Slightly irregular | Organic and tactile |
| B | More muted or mixed | Semi-polished with visible texture | Irregular shapes are more common | Rustic and natural-looking |
The grade gives you a useful visual expectation before you choose a specific stone. Natural banding, inclusions, zoning, and color shifts can still make every tumble individual within the same tier.
