Trinity, Three-stone Ring, Trilogy.
This style of ring goes by several names and represents the Past, the Now, and the Future.
And even though the central diamond is ‘only’ a 3ct oval-cut diamond, the ring looks gigantic due to two reasons:
An oval cut diamond requires less depth than a round brilliant-cut, hence the weight (1ct = 0.2gram) is in its spread, rather than in its depth.
The artist added 274(!) small diamonds for extra sparkle and volume.