14 Karat yellow gold, 40 grams with it’s venetian box chain. I’ve made 1, and unless something happens to destroy this, I don’t plan on ever making another. I wear it every single day, and if it were custom made, it’d probably run you $2,000 after materials, labor and metal. It’s about 40mm each way you measure it, or a bit bigger than a book of matches. It’s not that huge.