Coral - Gems Jewelry

Coral Gemstone Description

Color: Red, Pink, White, Black, Blue
Origin: Coral is primarily found in the Mediterranean Sea, the Red Sea, and the waters around Japan and Taiwan. The most prized variety, known as ‘Precious Coral,’ is typically sourced from the Mediterranean.

Chemical Composition	CaCO3 (Calcium Carbonate)
Crystal System	Amorphous
Hardness (Mohs)	3.5
Refractive Index	1.486 – 1.658
Specific Gravity	2.60 – 2.70
Optical Properties	Birefringence: 0.172, Pleochroism: None, Optical Character: Isotropic
Cleavage	None
Fracture	Conchoidal to Splintery
Luster	Vitreous to Dull
Transparency	Opaque to Translucent
Fluorescence	Weak to None

Color Factors: The most valuable coral is deep red, often referred to as ‘oxblood coral.’ Pink and white varieties are also sought after, though they tend to be less expensive. Black and blue corals are rarer and can command higher prices.
Clarity Factors: Coral is typically opaque, and its value is not significantly affected by clarity. However, smooth, blemish-free surfaces are preferred in high-quality pieces.
Cut Factors: Coral is often cut into cabochons, beads, or carved into intricate shapes. The quality of the cut can affect the gemstone’s value, with well-polished, symmetrical pieces being more desirable.
Carat Weight: Coral is often sold by size rather than carat weight, as it is relatively light. Larger pieces, especially in deep red, can be quite valuable.
Market Price Range: Prices for coral can range from $10 to $500 per gram, depending on the color, size, and quality. Precious red coral is typically the most expensive.

Cleaning: Coral is a soft gemstone and should be cleaned gently with a soft cloth and mild soap. Avoid using harsh chemicals or ultrasonic cleaners, as they can damage the surface.
Storage: Store coral jewelry separately from harder gemstones to prevent scratches. It is best to keep coral in a cool, dry place, away from direct sunlight, which can cause fading.
Handling: Coral is sensitive to heat and chemicals, so it should be handled with care. Avoid exposing coral to perfumes, lotions, or household cleaners.

Synthetic Identification: Synthetic coral is often made from dyed plastic or glass. Genuine coral will have a more natural, organic texture, while synthetic versions may appear too smooth or uniform.
Origin Identification: Mediterranean coral, especially red coral, is considered the most valuable. Coral from the Pacific, such as Japanese coral, is also highly prized. Be sure to ask for the origin when purchasing.
Inclusions: Natural coral may have small pits or striations, which are normal and do not significantly affect its value. However, excessive blemishes or cracks can lower the quality.
Enhancements and Treatments: Some coral is dyed to enhance its color, particularly in pink and red varieties. Heat treatments are also used to improve color. Always ask if the coral has been treated before purchasing.

Is coral a gemstone? Yes, coral is considered an organic gemstone, as it is formed from the skeletons of marine animals rather than minerals.
Can coral be worn every day? While coral can be worn daily, it is a relatively soft gemstone and should be handled with care to avoid scratches and damage.
What is the most valuable color of coral? The most valuable color of coral is deep red, often referred to as ‘oxblood coral.’
How can I tell if coral is real? Real coral will have a natural, organic texture and may show small pits or striations. Synthetic coral, on the other hand, may appear too smooth or uniform.