This criterion can be significant. In the mineral kingdom, large and perfect crystals are valued due to rarity in relation to smaller examples. A large crystal in and of itself is not significant. This criterion is only for large crystals that are equal or superior to smaller examples of the same mineral. For example: an aquamarine crystal that is two inches tall, gem clear, top color, and on a beautiful matrix is less important than one of exactly the same quality that is eight inches tall. Superb two-inch-tall aquamarines are not uncommon. However, eight-inch-tall examples are very rare. This criterion becomes more important in species that are rarely found in large sizes. We also limit this criterion due to the fact that not all collectors want larger specimens.