Glass bowls and vases of small loose fire opals from Mexico. The varied and bright colours are natural, in shades of orange and yellow.
The final photo shows examples of all the different colours and forms of opal that I have on my web site (at least until some sell). Just put "opal" into the search box to see them all.
Right: 3/4 inch (1.9 cm) diameter, 1/2 inch (1.3 cm) tall. Wide lipped dish. $18