Product Details. 1/25 Carat Rough Cut Light Grey Diamond Cube. Genuine Gemstone. Handcrafted in the USA.. Available in 14k Gold Filled or Sterling Silver.. Add this charm to your One Love Chain Necklace.. Comes with a little card that says:. Diamond - The April Birthstone. Enlighten your perspective, gain strength under pressure, respond with grace. Diamond is the stone of love, endurance, and unity. Let it serve as a reminder that true love can withstand any amount of pressure, and strengthens over time.