Crafters and jewelry makers, listen up! This set includes a whopping 1200 loose gemstones – a mix of cubic zirconia, synthetic corundum, and synthetic spinel in 12 different colors (each color has about 100 pieces). The stones are round cut and range in size from about 1.0mm to 10.0mm (the main size here is around 2.75mm in diameter). Colors follow the birthstone theme: January garnet, February amethyst, March sea blue, April white, May green, June lavender, July synthetic corundum, August olive, September synthetic spinel, October pink, November golden yellow, December blue. They're heat-resistant (white CZ up to 1500°C, colored CZ up to 700°C), perfect for DIY earrings, bracelets, necklaces, rings, clothing decor, and more. Note: colors might vary slightly due to monitor differences, and larger stones may appear darker. If you need other shapes or sizes, just search for XIANGMO. Get creative and sparkle on!