comes WITHOUT the chain. Estrogens (AmE) or oestrogens (BE) are a group of compounds named for their importance in the estrous cycle of humans and other animals. They are the primary female sex hormones. Natural estrogens are steroid hormones, while some synthetic ones are non-steroidal. Their name comes from the Greek words estrus = sexual desire + gen = to generate. (from Wikipedia)
This model is rather big. You can find a smaller one, more suitable for earrings, keychains or pendants here:
http://shpws.me/qHBO