Preferably as few as possible.
Diamonds are formed in a crystalline structure from carbon. Not all crystals are formed from carbon; not all crystals are diamonds.
Swarovski earrings are not real diamonds, therefore there is no concern about conflict free diamonds. Swarovski jewelry is made from crystals, not diamonds.
Swarovski crystals are a branded type of lead crystal that is made primarily of glass and lead and may also be coated with other materials. When comparing crystals to diamonds, they are commonly referred to as a diamond simulant. Simulants may look similar to a diamond, but do not possess the same properties. A diamond is formed from carbon and has a hardness of 10 on the Mohs scale -- the hardest. Lead crystal is graded around 6-7, though both can scratch glass.
Crystals and pure or uncut Diamonds and coral reefs.
From ExtremeScience.com: "Scientists estimate that about 50% of the moon's surface composition is oxygen, bound up in silicate minerals!" Even with extensive study, there have been no reports of diamonds or crystals in moon soil. Read more, below.
No they are crystals of an allotrope of Carbon.
Salt crystals may reflect light like a diamond, but salt crystals are not diamonds.
Crystals are solid materials with a regular, repeating atomic structure, whereas diamonds are a specific type of crystal composed of carbon atoms arranged in a diamond lattice structure. Diamonds are prized for their hardness and brilliance, while crystals can come in a variety of shapes, sizes, and compositions beyond just carbon.
There are many mineral crystals that have value. Some examples would be diamonds, rubies, amethyst, and sapphires. All are formed deep in the earth.
Diamonds come from deep within the earth, yes, a natural source.
You can ask for CZs, crystals, glass, ice and find what you're looking for. Moissanite can also pass very successfully for diamond. ===== Keep in mind that De Beers would like man-made diamonds classified as "fake" but they are definitely REAL. Man-made diamonds have the exact same chemical composition and structure as those dug out of the ground. Gem-quality diamonds grown in a lab can be chemically, physically and optically identical (and sometimes superior) to naturally occurring ones.
The cost of crystals can vary widely based on their type, quality, and rarity. On average, common crystals like amethyst or quartz can range from $10 to $50 per pound. However, rare or precious crystals such as diamonds or emeralds can cost thousands or even millions of dollars per pound.