Size of one piece: Approximately 2-4 x 1.5-3 x 0.5-2mm is the main size. Hole size: Estimated around 0.5mm Color: Blue These are chips (mini tumbles) of gem-quality neon blue apatite from Madagascar. Among apatites, those with a very deep blue color are called "neon blue apatite." As the name suggests, the vibrant neon color is attractive. Overall, a sense of transparency can also be felt.