This original watercolour painting of pink tourmaline, the October birthstone, is painted on cold pressed, slightly textured paper and mounted with an unframed size of 23cm x 23cm. The pink tourmaline symbolises love, compassion, and gentleness. Signed by R. Cox for authenticity.. Having been a gemmologist before returning to art, I now combine my two passions, capturing the beautiful way light dances across the gemstone’s facets.