This pin is a bespoke pin with a half carrot trillion diamond,set in 9ct gold,and the weight of the pin is1.8 grams.The diamond has been tested and is a very stunning diamond and must have cost a small fortune to of had this made.The pin is well over a hundred years and has no hallmark witch was quite common early Victorian times,the pin is in 9ct gold and comes in its own box stating the name of the jewelers etc.The box is in exelent condition and the inside reads as By appointment to H.M.The QUEEN..Goldsmiths and crown jewelers.GARRARD&COLtd.112,Regent street.W.L