The present invention is related with for manufacturing a device of gem grade diamond. Device has be arranged in series one most rooms (52) to allow the air-flow from the primary last room in one first Room. Each room has substrate stage assembling (10) to support and enter multiple diamond seeds (19) of room, a microwave generator (36) and a microwave source (38) via a microwave device (37) supply microwave energy). Gas supply (54) supplies gas to the diamond of the first Room of form. The gas supply of first Room is used to exit sequence in the case where becoming for then the first Room of the input of subsequent chamber of a second Room in series in gas. One vacuum pump is after heel row gas chamber.
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