"Clam Flower" Necklace Is a Tridacna carved pendant. This necklace measures approximately 20" around the neck with the central drop measuring almost 4". The focal flower measures 1 1/2" in diameter and is carved the same on both sides. Semi precious stones used to compose this necklace are quartz, tree agate, citrine, coral. Also some glass. I am a full time artist: instagram: bossertnancy but did jewelry with my Mother as a teenager and never wanted to give that tie to my Mother up. I have sold hundreds of necklaces through brick and mortar galleries and have just located Artpal. To the very best of my ability I am accurate on all I post. This has a bronze look metal toggle closure. Shipping free within the USA.