Elegant Arc Round Cut Moissanite Solitaire Engagement RingTrends fade. This ring will not. The Arc solitaire strips the engagement ring down to its most honest form one flawless round moissanite, held and nothing else. VVS1 clarity catches what the eye cannot ignore; DEF colour ensures the stone reads as pure white in any setting. Band: 925 sterling silver, finished in white, yellow, or rose gold. Stone: lab created, harder than sapphire, and brilliant enough to make diamonds question their pricing.