Coming Soon

The Diamond Mystery (1913)

Jonathan Moore, who has labored for over twenty years on a formula for the making of artificial diamonds, becomes mentally unbalanced from the strain, and in this condition believes he has ... See full summary »


Charles Kent


Add Image Add an image

Do you have any images for this title?



Cast overview:
Charles Kent ... Jonathan Moore
Mary Maurice ... Mrs. Jonathan Moore
Leah Baird ... Violet Moore, Their Daughter
Herbert Barry Herbert Barry ... Phelps Firestone
Courtenay Foote ... A Detective
Earle Williams
E.K. Lincoln ... (as Edward K. Lincoln)
Charles Edwards Charles Edwards
Joseph Baker Joseph Baker
L. Rogers Lytton L. Rogers Lytton
Frank Mason Frank Mason
Tefft Johnson Tefft Johnson


Jonathan Moore, who has labored for over twenty years on a formula for the making of artificial diamonds, becomes mentally unbalanced from the strain, and in this condition believes he has achieved his ambition. He writes to Bloodgood, the president of the International Diamond Syndicate in London, telling him of his invention. Bloodgood, becoming interested, cables to Rollins, the New York agent of the firm, to call upon Moore, look into the invention, but to make no definite stipulation for the purchase of it until he himself has arrived and examined it. Before Bloodgood arrives, however, Violet Moore's two suitors have become deeply interested in the invention, and one of them, Phelps Firestone, the son of a diamond merchant, realizing that if the invention is practical, his father will be ruined, appropriates the essentials of the formula and gives them to his friend, Bill, who later takes him to a counterfeiter's den, where he sells the formula for a large sum of money. With the ... Written by Moving Picture World synopsis

Plot Summary | Add Synopsis







Release Date:

14 July 1913 (USA) See more »

Company Credits

Show more on IMDbPro »

Technical Specs

Sound Mix:


Aspect Ratio:

1.33 : 1
See full technical specs »

Did You Know?


Publicity line: "The contest story of the Motion Picture Story Magazine, an absorbing plot with splendid acting, realistic and thrilling. The most exciting detective story ever shown." See more »

Frequently Asked Questions

This FAQ is empty. Add the first question.

User Reviews

Now and then, it shows carelessness in production
6 October 2017 | by deickemeyerSee all my reviews

Special feature picture in two parts. The fine quality of the photography is the first thing that will be noticed in this offering. The acting of the players is thus given a perfect medium and both reels are filled with many admirable things, bits of character drawing, flashes of insight with the intelligent setting forth of situations that makes a story credible. The average spectator will like it very much; because there is no dragging in it; it is full of life from beginning to end and it is also full of big things, such as the crowded grandstand of a race track. Now and then, it shows carelessness in production. For instance, when Phelps (Herbert L. Barry) examines the bottles in the laboratory of Moore (Charles Kent), the inventor of the fictitious diamond formula, he is supposed to be calling on the girl (Leah Baird); but he never sits down; he comes in, examines the things while talking to her and then hurries out. Charles Kent's facial expression is at times wonderful. Mary Maurice plays his wife and shows how the situation bites her. Leah Baird plays a charming girl with creditable smoothness. Courtenay Foote fills with dignity a conventional part, the detective. The others, Earle Williams, E.K. Lincoln, Charles Edwards, Joseph Baker, Rogers Lytton and Frank Mason deserve mention. - The Moving Picture World, July 26, 1913

0 of 0 people found this review helpful.  Was this review helpful to you? | Report this
Review this title | See one user review »

Contribute to This Page

Stream Trending Movies With Prime Video

Enjoy a night in with these popular movies available to stream now with Prime Video.

Start your free trial

Recently Viewed