Adamas

Also used as branding by Ovation for their very top end US products - I have not seen Ukuleles directly branded as Adamas but I have seen the name used in describing a number of the Ukulele colour schemes 

Ovation instruments all have the distinctive headstock shape and the composite round back but some models have a traditional central large sound hole and some have the small epaulette sound holes known as the bunch of grapes; I have even seen a special limited edition koa model the epaulettes in the shape of a palm tree. 

I have seen Soprano, Concert and Tenor ukuleless on sale but not all of them are available everywhere, (the Concerts for example I have only seen on sale in Japan and the Tenors not on sale in Europe?). I have never seen a Baritone model though and in 2014 all models were taken out of production. Sopranos with central sound hole were introduced again in 2016 in natural kos or black finishes.

For a while the model numbers at the end was usually a two character designation for the finish, so for example 5E means the black finish or A8 the Adamas blue This can also refer to the wood type of the soundboard if the instrument is uncoloured. (This was the case when Ukuleles were in production but this appears to have changed a bit now with one character becoming a lot more common?)