When considering the category of gemstones, the human imagination typically conjures images of crystalline minerals—diamonds, sapphires, or emeralds—formed through geological processes deep within the Earth's crust. However, the official state gemstone of Hawaii defies this traditional mineralogical classification. Hawaii’s state gem is not a stone, but an organism. It is an animal secretion, a biological marvel formed by colonies of living polyps that create a skeletal structure of calcium carbonate. This material, known as black coral, represents a unique intersection of biology, geology, and cultural heritage. Unlike the shallow-water reef-building corals that rely on photosynthesis and sunlight, black coral thrives in the deep, dark ocean, feeding on zooplankton. Its designation as the state gem in 1987 was a recognition not only of its aesthetic value but also of its ecological significance and its role in Hawaii's cultural history. The story of this gemstone is one of deep-sea discovery, strict conservation, and the delicate balance between harvesting for art and preserving a fragile ecosystem.
Biological Origins and Geological Distinction
To understand black coral, one must first distinguish it from the more commonly known reef-building corals. The term "coral" is often used broadly, yet there is a fundamental biological difference between the two. Shallow-water reef corals are symbiotic with algae and require sunlight to survive, forming the vibrant structures associated with tropical coastlines. In contrast, black coral, or Antipatharia, is a deep-sea organism. These are colonies of polyps, tiny soft-bodied creatures that secrete a hard, dark exoskeleton. While the living polyps themselves can exhibit bright colors, the material they leave behind—the black coral—is a dense, ebony-hued structure. This material possesses a unique luster and density that makes it suitable for high-end jewelry, a property that has been appreciated for millennia.
The biological classification of black coral places it firmly within the animal kingdom. Specifically, the polyps that create the black coral are animals, not plants or stones. This distinction is crucial for understanding the growth rates and conservation needs of the species. The skeletal structure is formed over centuries, growing in complex, branching, tree-like forms. These forms maximize the surface area available for the polyps to extract nutrients from the water. Over time, these colonies can grow into structures ranging from small fans to massive, continent-spanning reefs, though the black coral beds found in Hawaii are typically smaller in scale compared to shallow reef systems.
The specific species found in Hawaii include a variety of types. There are fourteen distinct species of black coral in the Hawaiian archipelago. Of these, nine species reside at depths exceeding one hundred meters. Two species, Antipathes dichotoma and Antipathes grandis, are particularly dominant and abundant. These species are the primary sources for the state gem. Their growth is incredibly slow, a factor that dictates both their value and the strict regulations surrounding their harvest. The black coral skeleton is composed of calcium carbonate, a material that can be polished to a mirror-like finish, a quality that predates the use of pearls in jewelry history.
The Discovery and Commercialization of Hawaiian Black Coral
The modern history of black coral as a commercial gemstone in Hawaii began in the mid-20th century. While indigenous Hawaiians have harvested black coral for generations, the establishment of a formal industry is credited to two divers, Jack Ackerman and Larry Windley. In 1958, these pioneers discovered the first significant beds of black coral in deep waters off the shores of Lahaina on the island of Maui. This discovery marked the birth of the local black coral jewelry industry. The material was found to possess an incredible luster and density, making it an ideal candidate for fine jewelry.
Following this initial discovery, the industry expanded. Maui Divers, founded by Ackerman and Windley, became a central figure in the trade. By 1987, the significance of black coral to the state was formally recognized when it was designated as the official state gem of Hawaii. This legislative act, codified in the Hawaii Revised Statutes (Section 5-15), established black coral as the state emblem. The designation was supported by the local jewelry trade, scuba divers, and the Department of Land and Natural Resources, reflecting a consensus on the material's importance to the state's identity and economy.
The discovery of other coral varieties in Hawaii further enriched the gemological landscape. In 1966, Pink Coral (Corrallium Secundum) was discovered off Makapuu Point, Oahu, in 1,200 feet of water. The industry began utilizing this coral for jewelry in the same year. Similarly, in 1971, Dr. Richard Grigg, utilizing the Star II submarine, discovered Hawaiian Gold Coral (Gerardia species) in the same general area as the pink coral discovery. By the year 2000, new beds of Gold Coral were identified, including one atop an ancient underwater volcano known as Cross Seamount, located 100 miles south of Oahu, and another off Keahole Point on the Big Island. These discoveries expanded the palette of materials available to Hawaiian jewelers, though black coral remained the primary state symbol.
Species Diversity and Growth Characteristics
The diversity of black coral in Hawaii is significant, with 140 species known globally, and 14 specifically found in the Hawaiian archipelago. Among these, Antipathes dichotoma and Antipathes grandis are the most prevalent and the only two species currently managed under CITES (Convention on International Trade in Endangered Species of Wild Fauna and Flora) permits. The growth characteristics of these species are a critical factor in their conservation status.
The growth rates of these deep-sea organisms are exceptionally slow, underscoring the necessity for strict harvesting limits. Antipathes dichotoma increases in height by approximately 2.5 inches per year, while Antipathes grandis grows at a rate of about 2.4 inches per year. Despite these rates, reaching a height of 6.5 feet can take decades. In comparison, other precious corals like Red Coral (Corallium Japonicum) grow even more slowly, at a rate of roughly 1/4 inch per year. This slow growth is the primary reason black coral is considered a precious and highly valued material.
| Coral Type | Scientific Name | Growth Rate | Depth Range | Primary Location |
|---|---|---|---|---|
| Black Coral | Antipathes dichotoma | ~2.5 inches/year | 300 - 3,000 feet | Auau Channel, Maui-Lanai |
| Black Coral | Antipathes grandis | ~2.4 inches/year | 300 - 3,000 feet | Auau Channel, Maui-Lanai |
| Pink Coral | Corrallium Secundum | Not specified in text | ~1,200 feet | Makapuu Point, Oahu |
| Red Coral | Corallium Japonicum | ~0.25 inches/year | 500 - 1,000 feet | Ogasawara and Ryuku islands |
| Gold Coral | Gerardia species | ~3 inches/year | ~1,300 feet | Cross Seamount, Keahole Point |
The table above illustrates the variation in growth rates and locations. While Antipathes grandis and dichotoma are the focus of the state gem designation, other corals like Pink, Red, and Gold coral contribute to the broader category of precious corals used in Hawaiian jewelry. Each possesses unique color spectra; Pink Coral ranges from almost white to hibiscus pink to salmon red, often with marbled shading. Red Coral, found in deep waters of the Ogasawara and Ryuku islands, is harvested from depths of 500 to 1,000 feet. Gold Coral, discovered more recently, grows at a slightly faster rate of approximately 3 inches per year, but harvesting is limited to only 3% of the bed annually.
Conservation Status and Regulatory Framework
The designation of black coral as the state gem is inextricably linked to its conservation status. The living animals that create the black coral are listed on the federal Endangered Species List. This status has triggered a rigorous regulatory framework designed to ensure the survival of the species. The Fishery Management Plan (FMP) for the Precious Coral Fisheries of the Western Pacific Region is the governing body that manages these ecosystems in Hawaii.
Strict caps are placed on the amount of black coral that may be harvested. The regulations, codified in the Hawaii Revised Statutes and federal laws (50 CFR 665.260 through 665.270), mandate specific harvesting techniques. Only selective harvest methods are permitted, such as hand harvest or the use of submersibles. Dragging the bottom of the reef is strictly prohibited to prevent collateral damage to the ecosystem. Furthermore, regulations prohibit the harvest of trees with a stem diameter less than 1 inch or a height of less than 48 inches. This ensures that only mature colonies are removed, allowing younger specimens to continue their slow growth.
The sustainability of the black coral fishery relies on a "sparing" approach. As noted by industry leaders like Cole Slater of Maui Divers, the goal is to harvest in a manner that ensures future generations can continue to utilize the resource. The industry has moved away from destructive bottom-dragging practices to careful, selective collection. This shift is reflected in the company's philosophy: "We don't drag the bottom of the reef and cut everything off." The emphasis is on preserving the black coral populations as a healthy part of the global ecosystem, ensuring that the species does not face extinction due to over-harvesting.
Cultural Significance and Artistic Applications
Black coral holds a profound place in Hawaiian culture, serving as more than just a decorative object. Historically, black coral has been harvested by Hawaiians for generations, valued not only for its beauty but also for its legendary effects on health and good fortune. In traditional Hawaiian belief systems, the coral was used as a medicine, a practice that underscores the deep spiritual connection between the people and their environment. The material is revered for its ability to take a perfect polish, a trait that has made it a staple in fine jewelry for over 25,000 years, predating the use of pearls.
In the realm of modern jewelry design, black coral is often set in yellow gold to create a stunning visual contrast. This combination has become a signature style for Hawaiian jewelers. Specific designs, such as the "Paradise Ring," feature ocean wave shapes cut from polished black coral, gold maile leaves representing Hawaiian royalty, and diamonds that shine like evening stars. These pieces serve as meaningful reminders of a visit to the islands, blending the natural beauty of the coral with the artistry of goldsmithing.
Other coral varieties also play a role in the cultural narrative. Pink Coral designs often reflect the beautiful and fragrant blossoms of the islands, such as the pikake flowers that are fashioned into leis. The "Princess Kaiulani" ring, named after the most beautiful princess of Hawaii, features a crown-like silhouette when viewed from the side. The industry has developed a reputation for selecting only the highest quality stones, adhering to rigorous standards of excellence. This commitment to quality ensures that the jewelry produced is not merely an accessory but a treasured keepsake.
The cultural value of black coral is also reflected in its legislative protection. The support for its designation as the state gem came from a coalition of scuba divers, the local jewelry trade, and the Department of Land and Natural Resources. This broad support indicates a societal consensus on the importance of protecting this resource. The fact that the living polyps are endangered underscores the urgency of these conservation efforts. The industry's shift toward sustainability is not just a business strategy but a cultural imperative to preserve the "ebony luster" of the deep sea for future generations.
Deep-Sea Ecology and Habitat
The habitat of Hawaiian black coral is defined by its depth and lack of sunlight. Unlike reef-building corals that live in shallow, sunlit waters, black coral thrives in deep, dark water, typically found between 300 to 3,000 feet below sea level. In Hawaii, nine of the 14 species of black coral live at depths exceeding 100 meters. This environment is characterized by a lack of photosynthetic activity, meaning the coral polyps must feed on zooplankton drifting through the water.
The growth form of black coral is typically branching and tree-like, a morphology that maximizes the number of polyps exposed to the water current to capture food. This structure allows the colony to survive in an environment where nutrients are scarce. The slow growth rate is a direct adaptation to this energy-poor environment. The "wire" or "whip" forms of black coral, such as Antipathes dichotoma and Antipathes grandis, are the dominant species in the channel between Maui and Lanai. These ecosystems are managed under the Fishery Ecosystem Plan (FEP), which aims to balance resource utilization with environmental protection.
The discovery of new beds, such as those found on the Cross Seamount, highlights the ongoing exploration of the deep ocean. These seamounts, which are ancient underwater volcanoes, provide hard substrates for the coral to attach to. The discovery of Gold Coral on Cross Seamount and Keahole Point demonstrates that the deep ocean is still revealing its secrets. The ability of these organisms to form structures ranging from hand-sized fans to larger reefs indicates the vast potential of these deep-sea ecosystems. However, the fragility of these habitats means that any disturbance can have long-lasting effects, reinforcing the need for the strict harvesting limits currently in place.
Conclusion
The story of Hawaii's state gemstone is a testament to the unique intersection of biology, geology, and culture. Black coral, a biological secretion of deep-sea polyps, has transcended its origins as a living animal to become a symbol of the state. Its designation in 1987 was not merely a symbolic act but a recognition of its intrinsic value and the need for its preservation. The slow growth rates, ranging from fractions of an inch to a few inches per year, combined with its endangered status, have necessitated a robust regulatory framework. This framework, managed by the Fishery Management Plan and federal laws, ensures that harvesting is selective and sustainable.
The cultural legacy of black coral is deep-rooted, serving as medicine, a symbol of good fortune, and a medium for exquisite jewelry. From the pioneering work of Ackerman and Windley in 1958 to the modern designs of companies like Maui Divers, the industry has evolved to prioritize conservation alongside commerce. The contrast of black coral against yellow gold, the intricate designs inspired by Hawaiian flora and royalty, and the strict adherence to harvest limits all reflect a society that values both the beauty and the ecological integrity of its natural heritage. As the deep sea continues to reveal new beds of gold and pink coral, the narrative of Hawaii's state gem remains one of careful stewardship, ensuring that the "ebony jewel" of the deep remains a treasured part of the islands' identity.