Ordered 15mm, but Got 16mm. 1st quality stones priced at a discount. Each one of these cabochon stones is hand made and pressed using the same skills and techniques used for generations in the Czech glass lampwork industry. Workers mix the colors to achieve the look of genuine stones, but with the artistry of glass. Available in a range of sizes in round, oval, pear, navette, square and more. Check out our other colors as well.