Tumblestone Sizes & Gradings
Tumbled Gemstone Sizes. This chart shows the actual sizes of the stones we offer.

We also include the approximate amount of stones per kg. There will be some variation due to stone shapes and specific gravity, but these figures have proved to be accurate averages over many years of production.

Tumbled Gemstone Gradings.

Sorted Grade: Most polished stone from size 1LG upwards are hand sorted. Initially, obviously off-coloured or mixed materials are removed. The batch is then inspected for chipped or broken stones. These are removed and what remains constitutes SORTED GRADE stock.

Unsorted Grade: It is difficult to hand sort sizes 00, 0 and 1SM economically, therefore these sizes are generally sold UNSORTED. The high percentage of usable material and the lower price combine to make UNSORTED GRADE stones most acceptable. In many instances sizes NO 1LG and No 2 are offered in both UNSORTED and SORTED grades.

This chart shows the sizes in which our stones are offered, together with the average number of stones per kilogram in each of our 12 different sizes. There may be minor variations due to individual stone shapes, differing specific gravity and other inherent factors, but the yields quoted have proved to be an accurate average over many years of production.