Koshimono (越物) is a traditional Japanese term used for Akoya pearls cultivated for a longer period, often through an additional winter, before harvest. This extended cultivation reflects a more time-intensive approach to pearl farming, prioritizing natural development over speed.

Allowing Akoya pearls to grow for a longer period supports a more fully developed nacre structure.

This can result in:

• Deeper, more layered luster
  
• Enhanced visual depth and clarity
  
• A softer, more refined surface glow
  

These qualities are often associated with pearls that feel visually richer and more enduring.

Not all Akoya pearls are classified as Koshimono.
Rather than a universal grade, the term reflects a long-held appreciation in Japanese pearl culture for time, patience, and thoughtful craftsmanship—values closely aligned with our approach to design and material selection.

To support transparency, select pieces may be accompanied by documentation from Pearl Science Laboratory (PSL｜真珠科学研究所) in Japan, a specialist institute known for pearl identification and quality analysis.

When available, this documentation offers additional insight into the pearl’s characteristics and reinforces our commitment to responsible, informed sourcing.

• Body Color
  The pearl’s base hue. Common body colors include white, cream, gold, charcoal, and gray. This is the underlying color you see first.
• Overtone
  A translucent secondary hue that appears to float over the body color. Overtone is subtle and luminous, adding depth and dimension rather than changing the base color.
• Luster
  The intensity and sharpness of reflected light on the pearl’s surface. High luster creates crisp reflections and gives pearls their signature glow.

Overtone is not a dye or surface treatment. It is a natural optical effect created when light interacts with the multiple layers of nacre that form a pearl.

Because Akoya pearls are known for their fine nacre structure and high luster, their overtones often appear especially clear and vibrant.

Common overtone references include:

• White pearls: rose, silver, cream/ivory
  (often referred to as the “three classic overtones”)
  
• Tahitian pearls: peacock, aubergine, steel blue

These overtones give pearls a sense of movement and depth that changes subtly with light and angle.

Overtone can influence:

• How pearls complement different skin tones
  
• How they photograph under natural or studio light
  
• Whether they feel more formal, soft, or contemporary
  

A simple skin-tone guide (not strict rules):

• Cool tones: silver or rose overtones; peacock or silver for Tahitian pearls
  
• Warm tones: cream, ivory, champagne, or golden families
  
• Neutral tones: most overtones work—choose based on mood, outfit, or setting

Ultimately, overtone is about personal preference and how a pearl makes you feel when worn.