C. 1960 Vintage Coral, Black Onyx and .20 ct. t.w. Diamond Pin with Black Enamel in Platinum

PLATINUM: A rare precious metal cherished for its longevity and strength. Platinum is naturally white, durable, dense, and resilient to discoloration. Most platinum in jewelry is at least 95% pure since it does not require alloys or plating.

REVOLVER: A safety that conceals the point of a pin and keeps it in place with a revolving lever mechanism.

CORAL: This prized sea stone conjures up images of exotic oceans and faraway places. With shades ranging from soft muted pinks to vibrant bold reds, coral jewelry complements every skin complexion with a warm glow.

CARVED: When a gemstone is cut so that the outline or surface takes the form or likeness of a specific image or pattern.

Diamond: The hardest and most brilliant of all gemstones, a diamond can make the heart race with its pure and fiery spark. An ancient symbol of love, a diamond is the preferred gemstone for tokens of affection, such as rings, earrings, necklaces and bracelets. Diamond is the birthstone for April.

SINGLE-CUT: A gemstone cutting technique that dates back to the 1300s. Still used today, the single-cut usually features 18 facets that go in one direction without crossing each other.

Color Grade H-I: Near-colorless

CLARITY SI1-SI2: Slightly Included. Inclusions are noticeable under 10x magnification.

ONYX: A favorite of the ancient Greeks and Romans, this gemstone adds a sophisticated shine to rings, necklaces, bracelets and earrings. A dyed form of chalcedony, onyx is most popularly found in black although it can be green, white or red, as well.