Amsterdam Black Diamond
| Cut | Pear Shaped |
| Weight After Cut | 33.74 Carats |
| Weight Before Cut | 55.85 Carats |
| Founded At | Unknown |
This magnificent historical precious diamond is also known as the Amsterdam Diamond. Rough Amsterdam Black Diamond was 55.85 Carats, It was cut in a pear shaped. The weight of Amsterdam Black Diamond is 55.85 Carats. Amsterdam Black diamond was exhibited on the 700th anniversary of the City of Amsterdam in 1975.
Amati Diamond
| Color | Unknown |
| Founded at | Unknown |
| Weight | 31 Carats |
| Present Owner | Unknown |
| Present Location | Unknown |
| Former Owner | Mrs. N. Coffin |
| Weight before Cut | Unknown |
Amati Diamond is 32 Carats. The location from which this magnificent diamond was founded is unknown. Amati Diamond belonged to Mrs M. Coffin but it was stolen in 1949. The present whereabout of this historical diamond is unknown.
Amarillo Starlight Diamond
| Weight | 16.37 Carats |
| Date | 1975 |
| Founded At | Diamonds State Park, Arkansas |
| Present Location | Unknown |
Ahmed Abad Diamond
Cutting Unknown
Weight 157.25 Carats
Origin Indian
Found Unknown
Former Owner Unknown
Present Owner Unknown
Present Location UnknownAccording to History Ahmed Abad diamond original weight before it was cut was 157.25 carats. There is very less information available regarding this diamond. The only information available is that it was bought by a Tavernier from India. Later it was cut in Paris. It is also believed that it was sold in Persia. The present as well as the former owner and location of this diamond is unknown. Like many other famous historical diamonds the whereabout of this precious diamond is unknown.